I must now give you some hints on cultivating your flowers. To begin with the bulbs, as they flower first in spring. The crocuses and snowdrops should be planted, five or six together, as close as possible, so as to form little tufts; and these, when once planted, should never be removed, unless they should grow out of bounds, so as to spoil the shape of the bed. The tulips, on the contrary, should be taken up as soon as their leaves begin to decay, and kept in a dry place till the proper time for planting them next year.
You must observe that there are three kinds of plants which are said to have bulbous roots: those which are solid, and which should be properly called corms, such as the crocus, the corn-flag, and many of the half-hardy plants with similar half-tubular flowers; the tunicated bulbs, which consist of a number of distinct layers, called tunics, that may be peeled off, such as the onion, the hyacinth, and the tulip; and the scaly bulbs such as the lily. Now the real roots of all these plants are the long fibres sent down by the lower part of the bulb, which may be seen plainly in hyacinths grown in glasses, and in any of the kinds if taken up while in a growing state; and what is called the bulb is, in all the corms, only a contracted stem; but, in the tunicated and scaly bulbs, the bulbous part is formed of a contracted stem and metamorphosed leaves. If you will take the trouble to examine a hyacinth, you will find at the base of the bulb a flat fleshy substance, called the root-plate, and this is, in fact, the contracted stem of the plant; while the tunics are metamorphosed leaves. In the scaly bulbs the stem is plainly perceptible in the centre, and the scales are evidently metamorphosed leaves. You will easily remember these distinctions, and you will find it useful to attend to them in cultivating your garden, as all plants having corms never flower well till they have been allowed to form a mass, which they will not do till they have been in the ground three or four years.
Many persons fancy that the Cape bulbs require to be taken up every year, but this is altogether a mistake: all the kinds of gladiolus, ixia, tritonia, and other similar plants, will live in the open ground, and flower well, if suffered to grow in masses, which would be killed by a single English winter if planted separately. The finest bed of the scarlet gladiolus I ever saw was at Blair-Adam, near Stirling, where it was suffered to remain year after year without alteration; and the Honourable and Reverend William Herbert, now Dean of Manchester, in his celebrated work on the Amaryllidàceæ, states that he has had beds of gladiolus, ixia, tritonia, and other Cape bulbs, at Spofforth in Yorkshire, which have remained for several years, without protection, in the open ground. Some persons say that, by manuring the beds every year, tulips and hyacinths may also be grown in the same beds without taking up, for several years in succession; but this I have never seen tried.
You must observe that you have no chance of keeping your flower-garden in a proper state, unless you have in some retired place what is called a reserve-garden, in which the plants may be brought forward till they are in a proper state for transplanting into the proper flower-garden. This reserve-garden is generally placed near the stable, both to have it out of sight, and for the convenience of manure; as it must contain hotbeds and frames, for rearing tender annuals, striking cuttings, and, in short, for performing all those gardening operations which require to be carried on behind the scenes.
In this reserve-garden you must bring forward your Californian annuals; and for this purpose choose a piece of hard ground, a walk will do, or any place that has been much trodden on, and cover it about an inch thick with light rich soil. In this the seeds of the annuals should be sown the first week in September, and suffered to remain till the bulbs have faded, and the annuals are wanted to cover the beds, which will probably be about April. The annuals must then be taken up with the spade, in patches, and being removed to the flower-garden, they must be laid carefully on the beds, so as to cover them exactly; the spaces between the patches being filled with soil, and pressed gently down, so that the surface of the beds may be as even as possible. These annuals will come into blossom in May, but they are killed by the dry heat of summer; and, though they would sow themselves if permitted to seed, it is better to remove them as soon as they have done flowering. It is always a bad plan to permit annuals to sow themselves; as early in autumn, when the plants have done flowering, the ground not only becomes rough, but it is covered with dead stalks and leaves, which have always a most miserable and desolate appearance; and these cannot be removed till the seed has fallen, while the beds must not be forked over and raked for fear of destroying the seedlings. It is therefore much better, as soon as the annuals have done flowering, to take them up, and throw them away; a supply of seed being preserved by having left some plants in the reserve-ground for that purpose. A second or spring sowing of the Californian annuals may be made in the reserve-ground, to be ready for use in case any should be wanted to flower in the autumn.
Though I have only advised you to have Californian annuals in your beds, I may here say a few words on the culture of annuals generally. You are, of course, aware that what are called annuals are plants that live only one year, or, rather, only a few months; for they are generally sown early in spring, and die as soon as they have ripened their seeds, at the latter end of summer, or the beginning of autumn. These plants are of three kinds; viz., hardy, half-hardy, and tender.
The hardy annuals are sown in March, April, or May; but the first month is to be preferred, if the weather is tolerably open. The ground in which they are to be sown is first forked over and raked, and a little round firm place having been made by pressing the bottom of the saucer of a flower-pot on the ground, a few seeds are scattered over it, taking great care that the seeds do not lie one upon another. The seeds are then firmed, as the gardeners call it, by pressing the saucer again upon them, and some earth is strewed lightly over to finish the operation. You will observe, that, though I have recommended you to take the saucer of a flower-pot to firm the ground, both before and after sowing your seeds, regular gardeners perform this part of the operation with their spades, and farmers roll their land before they sow their seeds. The principle, however, is the same in all; and it is that every seed requires to be securely fixed in the ground before it begins to germinate, in order to produce a strong and healthy plant. After the seeds are sown, it is customary to put a piece of stick into the ground, with the name of the seeds written upon it, to mark the place; or, if you like it better, you can write the name on a card, or a bit of pasteboard, and stick it in a notch or cleft cut in the stick.
When the seeds have come up, which, in the spring, is generally from a fortnight to six weeks after sowing, according to their nature, the seedlings may be thinned out, and the supernumerary plants either transplanted or thrown away. If the seedlings are to be transplanted, care should be taken not to break or injure the roots, and a little hole should be made with a stick for each seedling in the place to which it is to be removed; the earth being pressed close to the root at the bottom of the hole before the rest is filled in; as, if any hollow place is left round the root, it is sure to decay instead of growing. Seedling hardy annuals are, however, very seldom worth the trouble of transplanting. Many persons turn a flower-pot over every patch of seeds, from the idea that it will make them come up sooner, and protect them from the birds. It is, however, a very bad plan, as air and light are particularly necessary to seedling plants; and when they are even partially deprived of these important agents, they become drawn up with weak slender stems, and thin discoloured leaves.
Some annuals, such as the mignonette and the larkspur, are much longer before they vegetate than others; and these are better sown in autumn. Others, such as the escholtzia, the coreopsis, and the Erýsimum Perowskiànum, will often last two or three years, especially if they happen to be late in flowering the first season. They also do best sown in autumn, but they must be protected, if the winter should be very severe, by laying a mat over the bed. You must observe, however, that the mat must only be resorted to in frosty weather, as, in case the weather should be at all damp, the plants will be much better exposed to it, however cold it may feel, than they would be under any protection whatever.
The half-hardy annuals, such as the French and African marigolds, the German and China asters, the zinnias, the purple jacobæa, the sweet sultan, the purple and yellow everlastings, and other similar plants, should be sown in pots, and plunged into a slight hotbed in February or March. As soon as they come up, and have got their second pair of leaves, the earth should be turned out of the pot, and the seedlings being carefully picked out should be transplanted into other pots, three or five in each, according to the size they are expected to attain when full grown, and the pots again plunged into the hotbed. Sometimes they are transplanted a second time, but they are generally left till the beginning of May, when they are removed to the open border, to the places where they are intended to flower. When they are planted in the border, they may either be transplanted in the ordinary way, or the ball of earth may be turned entire from the pot into a hole made to receive it. This last plan is generally considered the best, as it prevents the plants from receiving any check by their removal. Brompton ten-week, and German stocks, though quite hardy, make better plants when treated like half-hardy annuals, as they flower earlier and much more vigorously.