Some plants may be grown to maturity in the Hotbed, particularly lettuce and radishes. After Hotbeds have been emptied of their plants, the sashes may be stored away, and the frames, with their spent manure, used for the growing of an early summer crop of melons or cucumbers.
House Plants. [See Window-Garden.]
Hyacinth bean
Hyacinth Bean (Dolichos Lablab). A very rapid-growing twiner, bearing fragrant flowers of purple or white. It is a fine screen plant. Plant seeds when the ground is warm where the plants are to grow; or they may be started early in pots. Height 10 feet.
Hyacinths are most popular winter- or spring-flowering bulbs. Hyacinths are hardy, but they are often used as window or greenhouse plants. They are easy to grow and very satisfactory. For winter flowering the bulbs should be procured early in the fall, potted in October in soil composed of loam, leaf-mold and sand. If ordinary flower pots are used, put in the bottom a few pieces of broken pots, charcoal or small stones for drainage; then fill the pot with dirt, so that when the bulb is planted the top will be on a level with the rim of the pot. Fill in around the bulb with soil, leaving just the tip of the bulb showing. These pots of bulbs should be placed in a cold pit, cellar or on the shady side of a building. In all cases, plunge the pot in some cool material (as cinders). Before the weather becomes cold enough to freeze a crust on the ground, the pots should have a protection of straw or leaves to keep the bulbs from severe freezing. In from six to eight weeks the bulbs should have made roots enough to grow the plant, and the pots may be placed in a cool room for a short time. When the plants have started into growth, they may be placed in a warmer situation. Watering should be carefully attended to from this time, and when the plant is in bloom the pot may be set in a saucer or other shallow dish containing water. After flowering, the bulbs may be ripened by gradually withholding water until the leaves die. They may then be planted out in the border, where they will bloom each spring for a number of years, but will never prove satisfactory for forcing again. The open ground culture of Hyacinths is the same as for tulips, [which see]. [See Bulbs.]
Water Culture of Hyacinths.—The Hyacinth is the most popular of the Dutch bulbs for growing in vases. The Narcissus may be grown in water, and do just as well, but it is not as pretty in glasses as the Hyacinth. Glasses for Hyacinths may be had of florists who deal in supplies, and in various shapes and colors. The usual form is tall and narrow, with a cup-like mouth to receive the bulb. They are filled with water, so that it will just reach the base of the bulb when it has been placed in position in the cup above. The vessels of dark-colored glass are preferable to those of clear glass, as roots prefer darkness. When the glasses, or bowls as above mentioned, have been arranged, they are set away in a cool, dark place to form roots like potted bulbs. Results are usually secured earlier in water than in soil. To keep the water sweet, a few lumps of charcoal may be put in the glass. As the water evaporates, add fresh; add enough so that it runs over, and thereby renews that in the glass. Do not disturb the roots by taking out the bulb.
Hydrangea. One of the commonest lawn shrubs is Hydrangea paniculata. The commonest fault in growing it is scattering the plants over the lawn, where they suffer in the competition with grass roots, and do not show off to advantage. It is far better to mass them in front of taller things. The Hydrangea blooms on wood of the season; therefore it should be pruned after bloom—in winter or early spring ([see Pruning]). Cut back heavily, in order to secure the strong new shoots upon which the flowers are borne.
Hyssop. [See Sweet Herbs.]
Ice Plant, or Mesembryanthemum. Fine little plants for rockwork or edging. The majority of the species are greenhouse and window plants, but a few can be recommended for outdoor planting. A very sunny location, with gravelly soil, will give the best results, either in the open or in the house. Easily propagated by pieces of the plant laid on moist sand in a somewhat sunny place. The common Ice Plant of window-gardens is readily grown from seeds or slips. It is prized for its glandular-glistening thick foliage (whence the common name). The little flowers, which open in sunshine, are also interesting.