Green-House
May
About the first of the month, all the small half hardy plants may be taken out of the green house, and those that are left will be more benefited by a freer circulation of air, which will enure them to exposure. The Geraniums ought to stand perfectly clear of other plants, while in flower and growing, or they will be much drawn and spindly.
Watering
We have advanced so much on this subject, another observation is not necessary; except as to succulents, which are frequently overwatered about this period. Before they begin to grow, once a week is sufficient.
Of bringing out the Green-house Plants
Those trees or plants of Orange, Lemon, Myrtle, Nerium, &c. that were headed down with the intention of planting them into the garden, to renovate their growth, should be brought out and planted in the situations intended for them. A good light rich soil will do for either, and the balls of earth might be a little reduced, that when they are lifted they might go into the same pot or tub, or perhaps a less one. This being done, the plants, generally in a calm day from the 12th to the 18th of the month, should be taken out, carrying them directly to a situation shaded from the sun, and protected from the wind. In regard to a situation best adapted for them during summer, see Hot-house this month, which will equally apply to Green-house plants, except Dáphne odòra, Dáphne hybrida, and the Green-house species of Coronílla, which must be shaded from every ray of the sun, and even from dry parching winds. All Primroses and Polyanthus delight in shade. The reason of so many plants of the D. odòraH dying is from the effects of the sun and water.
The large trees may be fancifully set either in a spot for the purpose, or through the garden. Put bricks or pieces of wood under the tubs to prevent them from rotting, and strew a little litter of any description over the surface of the soil to prevent evaporation, or about one inch of well decayed manure, which will from the waterings help to enrich the soil. A liberal supply of water twice or three times a week is sufficient. A large tree will take at one time from two to four gallons. We make this observation, for many trees evidently have too limited a supply. Continue to syringe the plants through the dry season every evening, or at least three times per week. All the tall plants must be tied to some firm support, because the squalls of wind frequently overturn them, and do much harm by breaking, &c. Keep those that are in flower as much in the shade as will preserve them from the direct influence of the sun.
Repotting Plants
After the following mentioned plants, or any assimilated to them, are brought out of the house, and before they are put in their respective stations, repot them where they are required to grow well. Aloes. These plants so varied in character, have been divided into several genera. These are Gastèria, Pachidéndron, Riphidodéndron, Howárthia, and Apicra. Of these there are above two hundred species and varieties. To enter into any specific detail, would be beyond our limits; but the catalogue at the end of the work will contain the finest species.
Amaryllis. This is a genus of splendid flowering bulbs containing about eighty species, and one hundred and forty varieties. They are natives of South America, but more than one half of them are hybrids grown from seed by cultivators. They are generally kept in the Hot-house, but in our climate will do perfectly well in the Green-house; and we have no doubt that in a few years many of them will be so acclimated, as to keep as garden bulbs, planting about the end of April, and lifting them in October. As the beauty of these plants is in the flowers, it will be proper to give a small description of a few of them. A. striatifòlia, has a stripe of pure white in the centre of each leaf, the flowers are purple and white, an esteemed species. A. Johnsòni, the flowers are a deep scarlet, with a white streak in the centre of each petal, four bloom on a stem of about two feet, each flower about six inches diameter; a bulb well established has two stems. A. regìna, Mexican Lily, has large scarlet pendant flowers, tube of the flower fringed-like, with three or four on the stem. A. vittàta is an admired species with scarlet flowers, striped with a greenish white. There are two or three varieties of it; corolla campanulate, three or four on the stem, about five inches diameter; petals a little undulate. A. fùlgida, flower scarlet, large tube striped, petals acute, two flowers on the stem. A. áulica is one of the most magnificent, has four flowers about seven inches diameter, erect on a stem about two and a half feet high; six petals, strongly united to the capsule, bottom of the petals green, connected with spots of dark crimson, which spread into fine transparent red, covered with rich tints, nerves very perceptible, anthers bold. It is called crowned Amaryllis. A. psittácina, Parrot Amaryllis, is scarlet striped with green, two flowers on the stem, each about five inches diameter. There are several varieties of it; the best that we have seen are cowbèrgia and pulverulènta. A bulb known in our collections as A. purpùrea is Ballóta purpùrea, has beautiful erect scarlet flowers, three or four on the stem, each about five inches in diameter. There are three varieties of it, differing only in habit. A. longifòlia is now Crìnum capénse, and is perfectly hardy; flowers pink, inclining to white, in large umbels, leaves long, glaucous, and is a desirable garden bulb.
There are many other superb Amaryllis, especially the hybrid sorts; from Johnsòni there are above twenty cultivated varieties; from formòsa above twelve; and from Griffìni about ten, all of them esteemed. Where they have been kept in the earth in which they were grown last year, the ball ought at this repotting to be reduced; when the bulbs are done flowering, they ought to have little water, so that they may be perfectly ripened, which will cause them to produce their flowers more freely.
Araucària. This noble genus contains four species, which are without exception the handsomest plants we are acquainted with, for the beauty of their foliage, and symmetry of their growth, that belong to the Green-house. A. excélsa, Norfolk Island Pine, has leaves closely imbricated as if with a coat of mail, and are imperishable. A. imbricàta, Chile Pine, is one of the grandest of trees, and is the hardiest of the genus; the leaves are also closely imbricated. The other two species are rarely seen even in European collections. The foliage of either of the species will adhere to the wood many years after the plant is dead. They are all highly valued, the pots must be well drained; for if the plants get much water while dormant, the foliage becomes yellow, and never attains its beautiful green colour again; otherwise they are easily grown.
Chamærops. There are about seven species of these palms: four of them belong to this department, and are the finest of those that will keep in the Green-house. They all have large palmated fronds, and require large pots or tubs to make them grow freely, and are tenacious of life if kept from frost.
Gardènia. This is an esteemed genus of plants, especially for the double flowering varieties, which are highly odoriferous, and have an evergreen shining foliage. G. flòrida flòre-plèno, Cape Jasmine, is a plant universally known in our collections, and trees of it are frequently seen above seven feet high and five feet in diameter, blooming from June to October. G. rádicans, dwarf Cape Jasmine, G. longifòlia, and G. latifòlia, are also in several collections, but not so generally known; the flowers are double, and all equally fragrant. We are inclined to think they are only varieties of G. flòrida. Any of the above will keep in the coldest part of the Green-house, and even under the stage is a good situation for them, where the house is otherwise crowded during winter. They must be sparingly watered from November to March. Much water while they are dormant, gives the foliage a sickly tinge, a state in which they are too frequently seen. G. Rothmànnia and G. Thunbérgia are fine plants, but flower sparingly; the flowers of the former are spotted, and are most fragrant during night.
Mesembryànthemum. A very extensive genus, containing upwards of four hundred and fifty species, and varieties, with few exceptions natives of the Cape of Good Hope. They are all singular, many of them beautiful, and some splendid; yet they have never been popular plants in our collections. The leaves are almost of every shape and form; their habits vary in appearance. Some of them are straggling, others insignificant, and a few grotesque. When they are well grown, they flower in great profusion; the colours are brilliant, and through the genus are found of every shade; yellow and white are most prevalent. Each species continues a considerable time in flower. The flowers are either solitary, axillary, extra axillary, but most frequently terminale; leaves mostly opposite, thick, or succulent, and of various forms. They are sometimes kept in the Hot-house, but undoubtedly the Green-house is the best situation for them. They must not get water above once a month during winter, but while they are in flower and through the summer, they require a more liberal supply, and they seldom need to be repotted; once in two years is sufficient.
Strelítzia, a most superb genus of evergreen perennial plants. They are greatly esteemed and highly valued in our collections. The finest flowering species are S. regìnæ and S. ováta; the former is the strongest of the two, but in respect to the beauty of their flowers there is no difference. The scape arises about three feet, headed with a sheath which lies horizontal before the flowers burst forth. The sheath contains three, four, or five flowers, according to the strength of the plants. These arise erect, and pass in a few days to the bottom of the sheath, the one before the other. S. hùmilis is another fine species, but the most rare are S. agústa, which has a leaf nearly like the plantain; S. jùncea, S. parvifòlia, and S. farinòso. The flowers of all these are yellow and blue, except those of S. agústa, which are white, and it flowers sparingly. A few species of these plants ought to be in every Green-house: they are vulgarly called Queen plant. While in flower they should be liberally supplied with water, but while dormant very sparingly. They will suffer sooner from the effects of too much, than too little water. The roots are strong tubers, and require plenty of pot room, and will thrive exceedingly where they can be planted in the soil.
Camellias
These plants, when they are brought from the Green-house, ought to be set in a situation by themselves, that they may be the more strictly attended to in watering and syringing. An airy situation where the sun has no effect upon them is the best. They should be syringed every evening when there has been no rain through the day. After heavy rains examine the pots, and where water is found, turn the plant on its side for a few hours to let the water pass off, and then examine the draining in the bottom of the pots, which must be defective.
Cape Bulbs
As soon as these are done flowering, and the foliage begins to decay, cease watering, and turn the pots on their sides, until the soil is perfectly dry; then take out the bulbs and preserve them dry until the time of planting, which will be about the end of August or first of September.
Notes
H On examining these plants, when the first appearance of decay affected them, the decayed part was without exception at the surface of the soil, which was completely mortified, while the top and roots were apparently fresh. This led us to conclude that the cause was the effect of sun and water on the stem. We have since kept the earth in a conical form round the stem, thereby throwing the water to the sides of the pot, and kept them in the shade. Previous to doing this, we had quantities died every year, and now no plants thus treated die with us.
May
It is highly desirable to have all the scientific operations as much advanced in the beginning of this month as is practicable, that at all times immediate attention may be given to the destroying of weeds wherever they appear.
Annuals, Hardy and Tender
By the first of the month finish sowing all hardy Annuals and Biennials; and about the middle of the month all those that are tropical. The weather being now warm, they will vegetate in a few days or weeks. Attend to thinning of those that are too thick, giving gentle waterings to such as are weak in dry weather. Those that have been protected in frames should be fully exposed therein night and day; take the first opportunity of damp cloudy days to have them transplanted into the borders or beds, after the 10th, lifting them out of the frame with as much earth as will adhere to their roots.
Care of Hyacinths, Tulips, &c.
For the treatment of these while in bloom, see last month. The best time to take them out of the ground is about five weeks after they are done flowering, or when the stem appears, what may be termed half decayed. The best method to dry them is to place the roots in rows, with bulb to bulb, the stems laying north and south, or east or west. Give the bulbs a very thin covering of earth, merely to exclude the sun, so that they may not dry too rapidly, being thereby liable to become soft. When they have thoroughly dried in this situation, which will be in eight or ten days in dry weather, (and if it rains cover them with boards,) take them to an airy dry loft or shade, clearing off the fibres or stems, and in a few weeks put them in close drawers, or cover them with sand perfectly dry, until the time of planting, for which see October.
It is not advisable to allow any of the bulbs of either Hyacinths or Tulips to seed, as it retards their ripening, and weakens the root, except where there are a few desired for new varieties. The small offsets must be carefully kept in dry sand, or immediately planted.
Anemones and Ranunculus
These while in bloom should be carefully shaded from the sun by hoops and thin canvass, or an erect temporary awning; and as soon as they are done flowering, they must be fully exposed, and the waterings given up.
Dahlias, Tuberoses, and Amaryllis
That are not planted, should now be done. For full directions see last month. In many seasons, any time before the twelfth is quite soon enough; but nothing ought to be delayed when the season will permit it to be done. It is necessary to have them properly labeled.
Auriculas, Polyanthus, and Primroses
They will now be done flowering, but still must be carefully kept in a cool, shady situation, and all decayed leaves cut off as soon as they appear. Examine them carefully and frequently, in case slugs of any description be preying upon them. A dusting of hot lime will kill them, or they may be otherwise destroyed. Some have recommended to repot and slip those plants when done flowering, “or they will contract a destructive disease;” which disease is a loss of verdure, and is induced by too much heat and drought, and a few other causes from inattention; but if attended to as above until September, when they should be fresh potted, they will have time to be sufficiently established before winter, which is the most judicious time to take off slips, for two reasons, viz.—they do not need so much nursing through the most precarious season of the year (summer) for these plants, and they begin to grow, and will root afresh sooner.
Double Wall-Flowers
As these are very seldom grown from seed, and are semi-biennials, art has to be used to preserve or renew them. About the end of this month take shoots of this year about three inches long, cutting them carefully off, and smoothing the cut end with a sharp knife; from this cut the lower leaves off about one inch and a half, and then put it in the ground; choose a very shady spot, mixing the soil with a little sand and earth of decayed leaves. Sprinkle them three times a day until they have taken root, which will be in a few weeks. Keep the cuttings about four inches apart.
General Observations
We do not consider that it is essential every month to repeat the necessity of tying up plants, saving seeds when ripe, cutting down weeds, raking, &c. with many other similar observations. We have already been full on these subjects, and expect these to be remembered through the season. Particular care, however, is required to carnations, pinks, or any plants that have heavy heads and slender stems. If carnations are desired to flower strongly, cut off all the buds except three, leaving the uppermost and any other two of the largest. All climbing plants should have timely support, and tied securely every week while they are growing.