Geranium.—Showy border flowers, mostly growing to a height of 1½ or 2 ft., having deeply cut leaves, and abundant saucer-shaped blossoms of considerable size. G. ibericum, platypetalum, armenum and Endressi are desirable purple- and rose-flowered sorts; G. sanguineum, a tufted grower, has the flowers a deep rose colour; and the double-flowered white and blue forms of G. pratense and G. sylvaticum make pretty summer flowers. Good garden soil.
Gerbera.—A South African genus of composites requiring very warm sunny spots and rich gritty soil. G. Jamesoni, with large scarlet marguerite-like flowers, and G. viridiflora, with white flowers tinged with lilac, are best known. Numerous hybrids have been raised, varying in colour from creamy white to salmon, pink, yellow, red and orange.
Geum.—Pretty rosaceous plants. The single and double flowered forms of G. chiloense and its varieties grandiflorum and miniatum, 2 ft., with brilliant scarlet flowers; G. coccineum, 6 to 12 in., scarlet, and G. montana, 9 in., yellow, are among the best sorts. Good garden soil.
Gillenia trifoliata.—A pretty rosaceous plant about 2 ft. high. Flowers white in graceful panicles; flourishes in a mixture of sandy peat and loam.
Gunnera.—Remarkable rhubarb-like plants with huge lobed leaves, often 6 ft. across. They should be grown near water as they like much moisture, and a good loamy soil. G. manicata and G. scabra are the two kinds grown.
Gynerium.—The Pampas-Grass, a noble species, introduced from Buenos Aires; it forms huge tussocks, 4 or 5 ft. high, above which towards autumn rise the bold dense silvery plumes of the inflorescence. It does best in sheltered nooks.
Gypsophila.—Interesting caryophyllaceous plants, thriving in dryish situations. G. paniculata, 2 ft., from Siberia, forms a dense semi-globular mass of small white flowers from July onwards till autumn, and is very useful for cutting.
Haberlea rhodopensis.—A pretty rock plant with dense tufts of leaves and bluish-lilac flowers. It likes fibrous peat in fissures of the rocks.
Helenium.—Showy composites of free growth in lightish soil. H. autumnale, 4 ft., bears a profusion of yellow-rayed flower-heads in August and September.
Helianthemum.—Dwarf subshrubby plants well suited for rockwork, and called Sun-Roses from their blossoms resembling small wild roses and their thriving best in sunny spots. Some of the handsomest are H. roseum, mutabile, cupreum and rhodanthum, with red flowers; H. vulgare flore-pleno, grandiflorum and stramineum, with yellow flowers; and H. macranthum and papyraceum, with the flowers white.