STRUCTURE
OF THE PLANTS.
If
we closely examine the varieties of any one species of the
Strawberry, we find that they resemble each other in their general
habits or manner of growth. No one at all familiar with these plants
would ever mistake an Alpine Strawberry for one of any other of the
well-known species, and even the Hautbois Strawberry, which, in some
respects, resembles the Alpines, is sufficiently distinct to be
easily recognized. There are varieties of the Wood or Alpine species
that produce no runners, growing in clumps or stools; still the
foliage plainly shows their origin, and, as we have no hybrids
between the Alpines and other species, there is no difficulty in
recognizing them wherever found. But with the North and South
American species or Virginian and Chilian Strawberries the line
of demarcation is not so easily determined as formerly, because
they hybridize so readily that their specific characteristics have
become almost obliterated in the cultivated varieties.
The
Chili Strawberry in its wild state produces larger and milder
flavored fruit than our common American or Virginia Strawberry, and
probably for this reason it has been a favorite with the cultivators
of the Strawberry in Europe, and nearly all of the noted varieties
raised abroad are of this species. This is why so few of the European
varieties, as they are termed, succeed in this country, having
descended from a semi-tropical species. But in recent years the
European and native sorts have been crossed and so thoroughly
intermingled that it is only occasionally that we can detect the
peculiar and distinct characteristics of either species in the
common cultivated varieties.
Fig.
6 —VIRGINIA STRAWBERRY
In
the old Triomphe de Gand Strawberry we have a pure descendant of the
Chilian species, and in the Wilson's Albany and Charles Downing,
pure native blood. The Wilson may be considered as a large
representative of the Wild Strawberry of the Eastern States, and the
Downing of the Western or of F. Virginiana var.
Illinoensis.
Fig.
7 — CHILI STRAWBERRY
The
varieties of our native species usually have long thread-like or wiry
roots, which penetrate the soil deeply and spread widely in search of
nutriment and moisture, while the roots of the pure Chilian varieties
appear to be more fleshy, shorter and not so hard and firm.
Another
peculiarity in the form and structure may be observed by an
examination of the old and mature plants. In our native varieties,
like the Downing and Boston Pine, they appear to remain low down in
the soil — not inclined to push above the surface — dividing
naturally, as shown in Fig. 6, while the Chilian varieties
assume the form shown in Fig. 7, which is an exact
representation — half natural size — of a three year old
plant of the Triomphe de Gand. It will be observed, by examining the
illustration, that all of the crowns are united to the main or
central one, with little. inclination to separate from it. These
elevated crowns contain the embryo fruit-buds, and the more they
extend above the surface of the soil the more likely they are to be
injured by the frosts of winter.
Varieties
of this form of root or crown soon extend, so far above the surface
that their new roots cannot, or at least do not, take a firm hold of
the soil in sufficient numbers to supply the plant with nutriment.
There
are many excellent varieties in cultivation that are inclined to
assume this form of growth, and they require somewhat different
treatment from those with shorter and. low-spreading crowns, as shown
in Fig. 6. When the latter are cultivated in hills or single rows,
the soil may be drawn up against the plants as their crowns protrude
above the surface, covering the new lateral roots, thereby increasing
the vigor and prolonging the life of the plants.
PROPAGATION.
The
three most common modes of propagation of the Strawberry are, viz.,
by seeds, runners and divisions of the crowns or stools. The first
mode, or by seeds, is practiced mostly for the purpose of producing
new varieties, but the wild plants of all the species reproduce
themselves from seed with very slight variations, and it is only from
the already improved varieties that we can expect to raise new ones
of any considerable value. If, however, we fertilize the pistils of a
wild plant with pollen from an improved one, we stand a fair
chance of obtaining seedlings showing an advance upon the wild
or parent plant. However, unless there is some special object in view
— such as extreme hardiness, or the adaptation of a variety to a
certain soil or situation — it is better to save seed from the
improved sorts than to go back or resort to the primitive or wild
species for a supply.
To
obtain seed it is only necessary to select the ripe berries, and
either crash the pulp and spread it out and dry it with the seeds,
thus preserving both, or the fruit may be crushed and the seeds
washed out. The sound good seeds will fall to the bottom, and the
pulp and false ones remain on the surface, from which both may be
readily removed. I have found seed preserved in the dried pulp of the
Strawberry remain sound and good for several years, and, if it is to
be kept for any considerable time, I should much prefer to have it
preserved in the pulp than to have it removed or washed out, but the
berries should be thoroughly dried and then put away in paper bags as
usually practised with clean seeds. I have received dried
Strawberries from Europe that were several years old, the seeds of
which, when soaked and washed out, sprouted almost as readily as
fresh ones.
My
usual practice in raising seedling Strawberries has been to gather
the largest and best berries, then mix them with dry sand, crushing
the pulp between the hands and so thoroughly manipulating the mass
that no two seeds will remain together. Then set away the box
containing the sand and seed in some cool place until the following
spring. Then sow the sand and seed together either in some
half-shady situation in the garden, or in pots, boxes or frames. The
soil in which the seed is sown should be of a light texture, to
prevent baking of the surface after watering. The seed should be
scattered on the surface, and fine soil sifted over them to a depth
of not more than one-quarter of an inch, or less than one-eighth.
Apply water freely with a watering pot or garden syringe, using
a fine rose in order that the water shall fall on the surface in the
farm of spray instead of a stream, as the latter is likely to wash
out the seed. By keeping the soil moist the plants will usually
appear in two to four weeks after sowing, and, if sown under glass or
in warm weather, in less time.
If
the plants do not come up so thickly as to be crowded, they may
remain in the seedbed during the entire season, but usually it is
better to transplant them into rows in the open ground where they can
have more room for development. All runners should be removed the
first season in order to secure as vigorous growth of the original
plant as possible. The following season the plants will bear fruit,
when the best and most promising may be preserved and the others
destroyed. It must not, however, be expected that a one-year-old
seedling is a fully developed plant, and for this reason it is well
to preserve all which give promise of excellence.
If
the seed is sown as soon as it is removed from the freshly-gathered
fruit in summer, it will sprout in two or three weeks, and produce
plants with several well developed leaves before the end of the
season, and, if given protection the first winter, they will make a
vigorous growth the next, and become somewhat larger plants than
those raised from seed sown in the spring of the same year. It is
best to give the seedlings some protection in cold climates in
order to secure their full development.
When
the plants come into bloom they should be carefully examined, and
those with pistillate flowers — as these will usually be the least
numerous — marked so that they will be known when the fruit is
ripe. When a variety has been raised that promises to be valuable,
the plant should be carefully lifted during rainy weather and set out
by itself for propagation.
The
plants may be removed from the seedling bed or rows soon after the
fruit is mature, or its character fully determined if carefully
lifted, and then given plenty of water and shaded a few days after
re-planting. It is not at all difficult to raise new varieties, but
to obtain one. worthy of propagation and dissemination is quite
another matter, and the chances are not more than one in a thousand
of obtaining a new variety from seed equal to the best of the old
ones now in cultivation. It is well enough, however, for every person
who has the time to spare and inclination to experiment, to try,
because there is not only a chance of producing varieties better
than any now in cultivation, but in addition the pleasure of watching
one's own seedlings grow and bear fruit.
Propagation
by Runners. — This is the natural method of propagation of all
the species and varieties except the Bush Alpines. The first runner
produced on a plant in summer is usually the strongest and best for
early removal, but those that are produced later in the season on the
same runner are equally as good when of the same age and size.
Certain theorists have, however, claimed that the first plant formed
on a runner near the parent plant was naturally stronger and better
in every way than those following or produced later, but long
experience has not proved this to be true. If the second, third
or fourth plant should happen to thrust its roots into richer soil
than the first one, they will become the larger and stronger plants
before the end of the season. To insure the rooting of the young
plants, the surface of the soil should be kept loose and open, and if
a top dressing of fine old manure can be applied just before or at
the time the runners are pushing out most rapidly, it will greatly
facilitate the production of roots.
Pot
Plants. — In the last few years what are called "pot-grown
plants" have become very popular among amateur cultivators, who
may desire to purchase a few plants and have them in the best
possible condition to insure rapid growth and early planting. To
accommodate this class of buyers our Strawberry growers have
made these pot-grown or layered plants a distinct feature of their
business. In propagating plants by this mode small two or three-inch
flower pots are filled with rich soil and then plunged in the ground,
around the old stools and in such positions as will admit of placing
a young plant while attached to the runner in each, or on the surface
of the soil in the pot so that the new roots will penetrate it. When
the new plants have produced a sufficient number of roots in these
pots to form a somewhat compact mass or ball of the earth
within, they are carefully separated, the pots lifted, and either
sent to the purchasers in the pots or knocked out, and each plant
rolled up separately in a piece of paper or some similar material.
Plants
that have become well established in the pots in time for planting
out early in the fall will often yield a moderate crop of fruit the
following season, which the amateur cultivator may value far more
highly than the professional who raises fruit for market. Pot-grown
plants cost more than those raised in the ordinary way, and they are
worth more, especially to persons who are anxious to test a new
variety or see Strawberries ripening in their own garden.
PROPAGATION
BY DIVISION.
This
mode is seldom practiced except with the Bush Alpines, which do not
produce runners. To propagate these varieties the old stools should
be lifted early in Spring and divided, leaving only one or two crowns
to a plant. If the old or central stems are very long, the lower or
older part may be cut away, leaving only the upper and younger roots
attached. In setting out again, the crown of the plant should be just
level with the surface of the soil in order that new lateral
roots may spring out above the old ones on the central stalk or stem.
SOIL
AND ITS PREPARATION.
In
its wild state the Strawberry is found growing in a great variety of
soils, from the rich alluvial deposits along rivers, up to the sand
hills and even bleak rocky ridges of Alpine regions. But as the
largest species and varieties are found growing in the richest soils,
so in cultivation we will ever find that large fruit, and this
in abundance, can only be secured by supplying a corresponding amount
of nutriment. New soils, free from weeds and noxious insects, are
certainly preferable to old, worn and badly infested; but as the
Strawberry grower can seldom have his choice in such matters, he must
use such as he has and overcome natural obstacles with artificial
remedies. A rather light soil or what would be called loamy soil, is
preferable to heavy clay, or the opposite extreme as seen in
sand and gravel. But natural defects can usually be remedied, for the
stiff cold clay can be improved by underdraining and subsoiling, also
by adding vegetable matter in large quantities. The main point to be
observed is to secure a good depth of soil with good drainage and
plenty of nutriment for the plants. Next in importance after
supplying what may be termed the substantial elements in the form of
nutriment comes moisture, for the Strawberry plant will use an
immense amount if it is obtainable, but stagnant water at the roots
or a constantly water-soaked soil are conditions to be avoided. A
soil that will allow the water falling in the form of rain to pass
down through it in a few hours, and still hold enough in suspension
to keep it moist for weeks, is a proper one for the Strawberry,
whatever may have been its original nature or condition.
Land
that will produce a good crop of corn or potatoes may be
considered in a fair condition for Strawberries, provided that
it is not so situated as to be in danger of flooding during the time
of the usual overflow of streams in winter and spring. But the
Strawberry requires a deeper soil than corn, and this may be
readily secured by deep plowing, or what is better, turning over the
surface soil shallow, and following with a subsoil plow, and in this
way avoid bringing the poorer subsoil to the surface. The land, if
naturally hard and compact, should be cross-plowed in the same way,
and, if manure is to be applied at all, let it be spread over the
surface before the first plowing, in order that it may become
well mixed and intermingled with the soil before the plants are set
out, that is, if ordinary kinds of composts or barnyard manure
are used. When commercial manures are employed they are usually
applied in the form of top, dressings at the time of setting out the
plants, or at various times afterwards as the plants may show
the need of more stimulants and nutriment.
Manures.
— The Strawberry is not so capricious as to refuse nutriment
in
almost any form when presented to its roots, but the quantity and
quality may be varied according to circumstances. On the rich
prairies of the Western States, or on newly-cleared land in the East,
no manure may be necessary in order to secure a heavy crop of fruit,
but the plants require nutriment in abundance, and, if it is not
natural in the soil, we must place it there in some form. As for the
kind of fertilizer to use, I have never, as yet, found anything to
excel thoroughly decomposed barn-yard manure. On light, warm, sandy
soils I prefer cow manure to that of the horse, as it is of a cooler
nature, but if manure from barn yard or stables is left in the yard
until it has become well rotted, or is composted with muck, leaves
and similar materials, it may be used on sandy soils, and in liberal
amounts without danger of over stimulating the plants. Bone dust,
superphosphate of lime, sulphate of ammonia, muriate of potash,
and wood ashes, may all be used where the land is poor or extra
stimulants are needed to force the growth and increase the size of
the fruit.
HOW
AND WHEN TO PLANT.
While
it is perfectly practicable to transplant the Strawberry at any and
all seasons of the year — except when the ground is hard frozen and
covered with snow — still there appear to be certain months during
which this operation may be performed with less labor and more
uniform success than during any other of the twelve. In warm
climates, as in our Southern States, the best time for setting out
the plants is late in the autumn or at almost any time during the
winter, but the earlier the better, in order to secure the benefits
of the cool moist weather during which the plants become well
established and in condition for growth at the approach of warm
weather in spring. But in cold climates late fall planting will, in
most instances, result in a total loss, as the frosts of winter will
lift the plants from the soil and destroy them. The two seasons most
favorable for planting the Strawberry in cold climates are early
fall, or from the middle of August to the first week in September and
early in the Spring. Fall planting, however, of the Strawberry is not
generally practiced in the Northern States except by amateurs and
with pot-grown plants. But in this matter of transplanting much
depends upon the season; if there is an abundance of rain during the
summer, strong, well-rooted plants may be obtained in August or by
the first of September, and if these are set out, and the weather
continues favorable, they will become well established by the time
cold weather sets in, and the following season make a much better
growth than if the planting was delayed until spring. But favorable
seasons are so uncertain that autumn planting is not a general
practice among those who make Strawberry culture a specialty.
Fig.
8 —YOUNG STRAWBERRY PLANT.
When
transplanting in the spring, the half-dead leaves should be removed
and the roots shortened one-third or one-half their length. In Fig. 8
is shown a terminal plant on a runner as taken from the ground. A,
the runner connecting it with the parent plant. B, the tip of the
runner which would have extended and produced another plant had it
not been checked by frost.
C
— D, the cross line showing the point at which the roots should be
cut. This pruning or shortening of the roots causes the production of
a new set of fibres from. the severed ends. It also causes other
roots to push out from near the crown, and if a plant thus pruned be
taken up in a few weeks after planting, its roots will appear
somewhat as shown in Fig. 9. This pruning of the roots is not so
generally practiced as it deserves to be, especially with plants that
have been out of the ground for several days, or until the roots are
withered or have commenced to decay at the ends. No matter how
carefully the plants are taken up, some of the fibres will be
broken off, and it is much better to sever all the roots with a clean
cut than to plant them with ragged and broken ends. Roots pruned in
this way are more readily spread out when placed in the ground again
than when left intact or of full length.
Fig.
9 — PLANT WITH ROOTS PRUNED.
Selection
of Plants. — Young runners of one season's growth are
best, and old plants should not be used for transplanting, if it can
be avoided. But, if a variety is scarce and valuable, the old stools
may be taken up and pulled apart, and the lower end of the central
stalk cut away as recommended for the Bush Alpines, and then set out
again, planting deep enough to ensure the emission of new roots above
the old ones.
DIFFERENT
MODES OF CULTIVATION.
The
cultivators of the Strawberry are not all of one opinion in regard to
the best mode of cultivation either in the field or garden;
consequently, we hear much about raising Strawberries in hills, rows,
matted beds, annual renewal systems, etc., all of which may give good
results, with productive varieties and on rich soils.
But
different varieties often require a different mode of culture in
order to obtain the largest yield and the largest berries. The large,
coarse-grown varieties of the Chili species, or the hybrid between
these and the Virginia Strawberry, succeed best when grown in
hills or single rows, and they are usually quite unproductive if
the plants are permitted to run together and become in the least
crowded. The Triomphe de Gand, Jucunda, Champion, Agriculturist and
Lennig's White are well-known varieties of this type; while others,
such as Charles Downing, President Wilder, Green Prolific and
Manchester, will yield well either in narrow rows or wide beds, and
where the plants become matted.
In
the "hill system" the plants are usually set out in rows
about three feet apart, and the plants eighteen inches to two feet
apart in the row. The ground is kept thoroughly cultivated among the
plants daring the entire season, and all runners removed as soon
as they appear, or at least once a week. This treatment will
insure very large and strong plants, with numerous crowns or
buds, from which fruit-stalks will push up the following spring.
In cold climates and where the plants are likely to be exposed to
alternate freezing and thawing, or to cold winds during the winter,
they should be protected by a light covering of hay, coarse
manure, or some similar material — just enough to protect the
crowns from injury but not enough to prevent freezing. In the spring
the materials used for protection may be removed, and the plants
given a good hoeing or a cultivator run between the rows to
soften up the soil, which may have become hard and compact during the
winter; but this cultivation in the spring will depend somewhat upon
the character of the soil, for, if it is light and of a sandy nature,
it will not be necessary, but it will certainly do no harm and may
prove of great benefit to the plants. After the beds are cleared up
and before the plants come into bloom, the entire surface of the
ground should be covered with long straw or some similar material as
a mulch to keep the soil moist and the fruit clean when it ripens. It
is almost a waste of time to undertake to raise the large varieties
in hills without mulching the plants, for the largest berries are
almost certain to become splashed with soil during heavy rains.
When
grown in single rows the plants may be set about twelve inches apart
in the rows, and for garden culture the rows should be about three
feet apart, but for field culture I prefer to allow a little more
space between the rows, or four feet, but the distance may be
varied according to the habit of the plants — some of the
rank-growing varieties requiring more room than those of a medium
growth, but it is much better to allow the plants plenty of room than
to have them crowded.
During
the first season the plants must be given good cultivation, and the
more the soil is stirred among them the better, provided the roots
are not disturbed by the implements employed in this work. In the
field a one-horse cultivator is the best implement to use for keeping
the soil loose and free from weeds between the rows, and, while the
hoe may be used early in the season to stir the surface about the
plants, it will have to be abandoned later on when the runners push
out, for these are to be allowed to take root in the row, and form a
bed about one foot wide, and all that extend out beyond this may be
cut off or torn up with the cultivator. Some cultivators allow the
runners to take root over a space of eighteen to twenty-four inches
wide, leaving just room enough between the narrow beds to give a path
in which to stand in gathering the fruit the following season. It is
doubtful, however, if any more fruit will be obtained from a larger
number of small plants than from less but of a stronger and more
vigorous growth, as they are more likely to be, if restricted to a
narrow row.
If
protection in winter is necessary — and usually it is in our
Northern States — it should be given as soon as the ground begins
to freeze in the fall or early winter. If applied before the weather
has become cool and the nights frosty, there is danger of the plants
sweating and bleaching. Still, it is not well to delay covering up
until snow falls and prevents it.
Coarse,
strong manure from the stable or barnyard, scattered along over the
crowns of the plants, makes an excellent winter protection, but as
such material contains many weed seeds, it should be employed only on
beds that are to be plowed up after fruiting the ensuing season.
In fact, it will seldom pay the cultivator to clean out an old weedy
plantation, for it costs less to set out a new one.
Bed
or Matted System. — In this mode two or three rows are planted
in beds four feet wide, and the . plants allowed to cover the entire
surface until they form a close mat or bed; hence the name. One or
two crops are taken and then the plants are plowed up as usual when
cultivated in rows. But, by thinning out occasionally, the beds
may be kept in a moderately productive condition for several
years, especially with some of the more slender growing of our native
varieties. Some cultivators, who raise Strawberries for market, adopt
what may be called an annual system, setting out plants in spring
either in single rows or narrow beds, giving them extra care during
the first season, then, after the fruit is gathered the next summer,
the beds are plowed up. This mode necessitates the making of a new
plantation annually. On very rich soils and with the larger
varieties — which generally command the highest price in market —
this system is no doubt an excellent and profitable one. But
amateurs and others, who have only a limited space to devote to this
fruit, will prefer either the hill or row system, because, by
devoting a little more labor to cultivation and removing the runners,
the beds may be kept in good condition for fruiting a half dozen
years. By an occasional top-dressing of old and well rotted manure,
and forking in the materials used for protecting the plants and
a mulch, the soil will be kept in fine condition for insuring a
vigorous growth of plants. Old beds, however, are usually more likely
to be infested by noxious insects than new ones, in addition to
weeds, such as white clover, which are difficult to eradicate without
disturbing the roots of the plants.
Planting.
— The surface of the bed or field to be planted should be made
smooth, level and free from lumps and stones. If it is uneven and
there are many little hillocks and depressions, as are naturally left
after plowing, the plants will follow these undulating lines, and
some will be buried too deep and others have their roots exposed
after the first heavy shower.
Always
choose a cloudy day for planting, and it is far better to heel the
plants in for a few days and give them a little water and shade than
to set them out in dry weather. Draw a line where you are to set a
row of plants, keeping it a few inches above the ground, so that you
may plant under it instead of along one side. Use a transplanting
trowel for making holes for the reception of the roots, and
these should be spread out evenly in all directions, or spread apart,
so that they will lie against one side of the hole made with the
trowel Cover the plants as deep as possible without covering the
crowns, and then press the soil down firmly around the roots. Some
cultivators use a small wooden dibber for planting, merely making a
round hole in the soil into which the roots are thrust all in a
clump. Plants may live under such treatment, but careful planting
with a trowel is far the best mode. If the weather should prove dry
after planting, watering will, of course, be beneficial; but is only
practicable on a small scale, as in gardens, or where it may be
necessary to save some new and choice variety.
Where
pistillate varieties are raised for the main crop then every fourth
or fifth row should be planted with some hermaphrodite or perfect
flowering variety, which blooms at or about the same time as the
pistillate.
If
the plants are cultivated in wide beds, then about every third one
should be planted with some perfect flowering sort to supply pollen
to the pistillate plants. But, as I have said elsewhere, there is no
need of, or good reason for, cultivating these imperfect flowering
varieties at all, and, unless one should appear better than any as
yet known, they might all be discarded without loss to either
cultivators or consumers of this fruit.
To
Raise Extra Large Fruit. — First of all secure plants of
varieties known to grow to a large size, then plant in rich soil,
remove the runners as soon as they appear, keep the weeds down,
stir the surface of the soil frequently, apply water as often as
necessary, which will be at least twice a week in dry weather, also
give liquid manure occasionally; in fact, force the plants to make a
strong and vigorous growth. In the fall, or at the approach of
cold weather, cover the plants with hay, straw, or some similar
material, and in the spring remove it and spade or fork up the ground
between the rows, after which spread over the ground sufficient mulch
to keep the soil moist even during the time of drought. Under such
treatment extra large berries may usually be produced. The cost
of raising fruit by such modes of cultivation is, of course,
seldom taken into consideration, and it really ought not to be any
more than any other amusement devised for our own pleasure or that of
our friends.
Of
course, it is not to be supposed that large and fine fruit cannot be
raised without extra and expensive modes of cultivation, but I have
yet to learn of an instance where "astonishing" large
Strawberries have been produced without a corresponding outlay
in manure, labor and care.
POT
CULTURE AND FORCING.
It
often occurs that Strawberries ripening out of season are far
more valuable than those maturing in the usual or natural season.
Ripe Strawberries in mid-winter or even a month or two in
advance of the crop ripening out of doors, always command an
extra price in our markets; and, if a person does not care to raise
fruit to sell, he may take pride in having them on his own table out
of the regular season.
It
is not at all difficult to raise Strawberry plants in pots and force
them into fruiting at almost any season as desired, provided a person
has a greenhouse, pit or hot-house in which the plants may be stored
and forced with artificial heat during cold weather.
The
plants to be forced may be of either one or two seasons' growth. If
strong plants are desired and such as will produce a number of
fruit-stalks, small young plants should be potted in the spring,
using four or five inch pots for this purpose. The pots containing
the plants should be plunged in the open ground, and where water can
be given as required, and all runners removed as soon as they appear,
also flower and fruit stalks. In June or July shift the plants into
eight-inch pots, using very rich and compact soil. A few pieces of
broken pots or old sods should be placed in the bottom of the pots
for drainage, but the ball of earth about the roots must not be
broken when transferring from the smaller to the larger pots. Give
water to settle the soil in the pots, then plunge the pots in a frame
where they will continue to grow without check until the approach of
cold weather.
Plants
wanted for an early crop may be brought into the house in November,
as it will take from ten to twelve weeks from the time they are
placed in the house before ripe fruit can be obtained. The pots may
be plunged in tan or some similar material in the forcing house or
merely placed on the benches or shelves, but more care is required in
giving water, if the pots are exposed, than when plunged in tan or
soil.
If
a succession of crops is desired, then only a portion of the
plants should be brought in at one time.
The
temperature of the house should be only moderate at first, but
increased gradually as the plants commence to grow and the fruit
stems appear, when it should range from 65 to 75 degrees during the
day and about ten degrees lower at night.
The
plants will be benefited if syringed or watered overhead once or
twice a week until they come into bloom; then omit it until the fruit
is set, after which it may be continued as before. While the plants
are in bloom, admit as much air as possible without lowering the
temperature to a dangerous. degree, and, as there will be neither
wind or insects to scatter the pollen, it is usually necessary to
scatter it artificially. This can be done very rapidly with an
ordinary camel's hair brush or pencil, lightly touching the stamens
and pistils as each flower becomes fully expanded. This is not
necessary with every variety, but a larger and more uniform crop will
usually be secured if practised on those fruiting most freely in the
house.
The
plants that are kept for forcing later in the season should be
stored in a cold frame or pit, where they will remain in a dormant
state until ready for use.
Plants
of one season's growth or those struck in pots during the summer will
answer well for forcing in winter. The plants will not be as
large as older ones, or produce as many berries, but, as they are
smaller, a greater number can be forced in a given space. The first
or earliest runners should be selected for this purpose, and a
three or four-inch pot plunged in the ground underneath, or if roots
have formed on the young plant when the pots are set in place, they
may be thrust into the pot and good soil filled in about them. These
pot-grown plants should be lifted early, or about the first of
October, and shifted in to five or six-inch pots, filled with very
rich compost and plenty of drainage — thenceforward treated as
advised for older stock.
Such
pot-grown plants may be fruited in the windows of an ordinary
dwelling, provided the temperature does not fall below 40 or 45
degrees at night. The best varieties of the Strawberry for the
purpose, however, are the Monthly Alpines, as they will thrive in a
lower temperature than those of other species, and, with
ordinary care, will continue to bloom and bear fruit all the year
round. Fruit is not produced in any great abundance at any one
season, but, the crop being a continuous one, it amounts to a pretty
fair quantity during the year. As an ornamental window or greenhouse
plant there are very few bearing edible fruit worthy of more care or
attention than the Monthly Alpine Strawberry.
VARIETIES
FOR FORCING.
Nearly
all of the perfect flowering varieties succeed when forced under
glass, but the largest and most prolific are to be preferred,
because size and quantity are properties sought more than high
flavors in a Strawberry "out of season." An eminent English
authority (G. W. Johnson) in referring to that subject in a work
published some forty years ago, very truly says that "no
plant is more certain of producing a good crop, when forced, than is
the Strawberry, if properly treated; and none will more assuredly
disappoint the gardener's hope, after a fair promise, if he adopts
the too common error of forcing too fast." The Strawberry
naturally blooms in the spring when the nights are cool and the day
temperature far lower than later in the season; consequently, a
high temperature is neither required nor beneficial to plants when
first placed in the forcing house. Air should be admitted freely
during the night, and the temperature kept low until the plants
come into bloom, then an increase of several degrees is admissible,
but at no time is a very high temperature required.
The
larger varieties, such as Sharpless, Miner's Prolific, Seth
Boyden, Cumberland Triumph, and American Agriculturist, are all
excellent sorts for forcing, especially when extra size berries
are an object.
In
Europe forcing the Strawberry is practised more extensively than in
this country, but the demand for this fruit out of its natural season
is constantly increasing, and will, no doubt, continue to
increase for many years to come. Twenty-five years ago the Strawberry
season in our large cities scarcely extended beyond a period of six
weeks, but now it is nearly six months, for ripe Strawberries come
North from the Gulf States before the frost has left the ground in
the Northern, and before these two early berries reach us from the
South, those raised by forcing houses may be found in limited
quantities in our fruit stores. Of course, this early or forced
fruit commands a high price, but those who are able and willing to
pay for such luxuries should be, and are usually, accommodated.
FORCING
HOUSES.
Almost
any ordinary greenhouse may be used as a forcing house for the
Strawberry, provided it is so constructed that the plants can be
placed near the glass. If the plants are placed several feet below
the roof or glass, they are likely to be drawn, as it is termed, the
leaves and fruit-stalks growing tall and slender. Low houses are,
therefore, better for this purpose than high ones, and even
low-walled pits, heated by brick flues or earthen pipes, answer well
for forcing the Strawberry.
INSECT
ENEMIES.
Until
within the past decade or two the Strawberry was rarely injured —
at least not to any extent — by either insect or disease. But as
its cultivation is extended it naturally encounters a greater number
of enemies. Probably the most destructive pest is known under the
common name of White Grub, or larva of the May Beetle. There
are, however, over sixty distinct species of the May Beetle
inhabiting the United States, but, as their habits are very nearly
the same, they may for all practical purposes be considered as
one. There is scarcely a mile square of good arable land in the
United States that will not yield to the careful collector at least a
half dozen species of Lachnosterna or May Beetles. They are
more or less abundant in the Gulf States, and northward to Canada;
thence westward to California and along the entire Pacific
coast. These insects are usually more abundant in grass-lands,
prairies, meadows and pastures than elsewhere, as the principal food
of the grubs is the roots of grass and small herbs like the
Strawberry. They sometimes become so abundant in meadows and pastures
that, if such land is plowed up and planted with Strawberries, the
grab will destroy every plant almost as soon as it is put into the
ground. As these insects remain in the grub stage two or three years,
they consume a large amount of food, and they appear to prefer the
roots of the Strawberry to those of the common kinds of grasses.
Owing
to the wide distribution of these insects, and their almost universal
presence in old meadows and pastures, these lands should be
avoided whenever possible. If broken up and cultivated for a year or
two, or until the grubs have passed into the beetle stage, there can
be no objection to such lands if otherwise adapted to the
Strawberry. The female beetles usually resort to uncultivated
fields to deposit their eggs; consequently they are not likely to
become very abundant in those that are constantly kept under
cultivation.
The
Strawberry worm (Emphytus maculatus) is occasionally very
abundant and destructive. It is a small, slender, pale-green worm
about five-eighths of an inch long, attacking the leaves, eating
large holes in them at first, but eventually entirely denuding the
plant of foliage. Dusting the plants with lime when the leaves
are wet with dew, or with Paris green, will usually check this pest.
In
Canada And some of the Western States an insect known as the
Strawberry Leaf-Roller is occasionally quite abundant and
destructive. It is the larva or caterpillar of a small and handsome
moth, the Anchylopera fragaria. It is quite probable that
Paris green would be an effective remedy and might be safely used
after the fruit was gathered in summer.
There
are also several species of beetles that attack the crowns and stalks
of the Strawberry, and the common Strawberry Crown-borer
(Tyloderma fragaria) attacks the embryo fruit-stalks in the
spring, thereby destroying the most important organ of the
plants. The only remedy known is to immediately plow under the plants
and destroy the grubs while in an immature stage. In my own
experience, however, I have never, as yet, encountered an insect
enemy of the Strawberry which could not be readily vanquished by
clean cultivation and frequent renewal of the beds on
plantation.
|