306 Encyclopaedia of Gardening 



ful and interesting plant. By making a choice of varieties bloom 

 can be had for six months if there is glass. For other town plants, 

 see Suburban Gardening, p. 296. 



Trachelium caeruleum, Throatwort (trache-lium, from trachelos, 

 the neck, in allusion to its virtue in diseases of the trachea. Ord. 

 Campanulaceae) . A greenhouse herbaceous perennial, growing 

 about 2 ft. high, with light blue flowers in summer and autumn (see 

 the Botanical Register, t. 72). Album is. a white variety. Loam, 

 with sand and a fourth of leaf mould, suits. Propagation is by 

 seeds in a warm house or frame in spring, or by cuttings in spring; 

 young plants should be stopped to induce a compact habit. 



Trachycarpus (trachycar-pus, from trachys, rough, and karpos, 

 .fruit. Ord. Palmae). Fan palms. T. excelsa (syn. Fortunei) is 

 the same as Chamaerops humilis, and may be grown out of doors 

 in mild, sheltered places only. Martiana should be kept in a green- 

 house. Loam, with sand and a third of peat, suits. Propagation 

 is by seeds in heat. 



Tradescantia, Spiderwort (tradescan-tia, after J. Tradescant. 

 'Ord. Commelinaceae) . Vigorous herbaceous perennials, one of 

 which, zebrina (syn. Zebrina pendula) , is a great favourite for hang- 

 ing baskets; it may be grown in pots stood in ornamental vases in 

 Tooms; its foliage is prettily striped, and its habit pendulous; if 

 given sufficient water it grows luxuriantly, and forms a new shoot 

 at every broken tip; it may therefore be propagated readily by 

 cuttings. Reginae also has pretty leaves. Virginiana (syn. Vir- 

 ginica) is the popular hardy Spiderwort; it grows about a foot high, 

 -and has blue flowers in spring (see the Botanical Magazine, t. 105); 

 there are several varietes, including a white and a double. They 

 will thrive in ordinary soil, and are propagated by division in spring. 



Tragopogon, Goat's Beard (tragopo-gon, from tragos, a goat. 

 Ord. Compositae). Porrifolium is the Salsify (see Kitchen Garden). 

 Pratensis is the common Shepherd's Clock. Both are biennials, 

 with yellow flowers in late spring. Ordinary soil. Propagation is 

 "by seed in spring. 



Traveller's Joy, Clematis Vitalba. 

 Tree Mallow, Lavatera arborea. 

 Tree of Heaven, Ailantus glandulosa. 

 Trees. See Flower Garden. 

 Trefoil. See Trifolium. 



Trellis. Expanding wooden trellis, which seedsmen supply, is 

 useful for forming screens and shelters quickly. It should be 

 covered with climbers as speedily as possible, to take off the stiff- 

 ness. The trellis should be secured to strong uprights, and should 

 be painted green or creosoted. 



Trenching. See Kitchen Garden. 



Trichinium (trichin-ium, from trichinos, hairy. Ord. Amaran- 

 taceae). T. Manglesi is a charming little greenhouse perennial, 



