These magnificent stove plants are much admired for their handsome, often variegated, leaves, and for their striking appearance. They like a compost of sandy loam and fibrous peat in lumps, with some sphagnum and small pieces of charcoal, keeping the soil and bulbs a little above the top of the pots, with a surfacing of cocoa-fibre or sphagnum. The pots can hardly be over-drained, and from a half to two-thirds full of broken crocks is a good proportion of drainage. They require a moist atmosphere and plenty of water while growing; a summer temperature of seventy-five to eighty-five degrees and a winter one of sixty to sixty-five degrees are suitable. A little liquid manure may be given at intervals. They are increased by division of the stem or rhizome, or by seeds. The following selection comprises some of the finest grown:--Chelsonii, cuprea, metallica, hybrida, Jenningsii, Johnstoni, macrorhiza variegata, scabriuscula, Sedenii, thibautiana, and zebrina.
These are singular stove plants, allied to the Arums, but of most value for sub-tropical bedding. They must be kept dry and in a warm place in winter, and started in a moist atmosphere and a temperature of from fifty-five to seventy degrees. They are never likely to become popular for ordinary gardens, so that details would be unnecessary here. Campanulatus, Lacouri, Rivieri, and Titanum are the best known species.
These singular, but not showy plants, require somewhat similar cultivation to the Arums, and may be grown in any heated greenhouse in rather light but rich soil. They should have plenty of water while growing. The best species are concinnum, about two feet high; curvatum, about four feet high, and both flowering in June; also galeatum, Griffithi, nepenthoides, and speciosa.
The greenhouse and stove Arums thrive in a warm, moist temperature, and are curiously interesting as well as worthy of being admired for the beauty of their foliage. Rich loam, a little sand, and some thoroughly rotted manure will grow them well. After flowering they may have the supply of water restricted so as to keep them at rest until spring, when they start into growth again. Among the most useful of the greenhouse species are sanctum or palæstinum, spectabile (half-hardy), and spirale.