=Water Lily.= See Nymphæa, Nelumbo and Victoria. =Water-Melon= (_Citrullus vulgaris_). _Cucurbitaceæ._ Seeds, usually sown where the plants are to remain, after the weather is warm and settled. =Watsonia= (Bugle Lily). _Irideæ._ The plants are multiplied by seeds or by offsets. =Wax Flower.= See Hoya. =Weigela.= See Diervilla. =Wellingtonia.= See Sequoia. =Whin.= See Ulex and Genista. =White Cedars.= See Chamæcyparis and Thuya. =White-wood.= See Liriodendron and Tilia. =Whitlava.= See Phacelia. =Whortleberry=, Huckleberry (_Gaylussacia resinosa_). _Ericaceæ._ Propagated by seeds, which should be stratified and otherwise carefully handled. (See also Vaccinium.) =Willow.= See Salix. =Wind Flower.= See Anemone. =Windsor, Broad or Horn Bean= (_Vicia Faba._) _Leguminosæ._ Propagation by seeds in open air after the soil is fairly warm. =Winter Aconite.= See Eranthis. =Winter Cress.= See Barbarea. =Wistaria.= _Leguminosæ._ Readily grown from seeds. Sometimes by division. Layers. Cuttings of ripened wood, usually handled under glass. The common purple and white kinds are largely grown from root-cuttings, an inch or two long, placed in bottom heat, when they will start in four or five weeks. Many of the fancy kinds, especially when wood is scarce, are root- or crown-grafted upon _W. Sinensis._ =Witch-hazel.= See Hamamelis. =Woad-Waxen.= See Genista. =Woodbine.= A name properly belonging to climbing Loniceras, but often applied to Ampelopsis, both of which see. =Wormwood=, Southernwood (_Artemisia Absinthium_). _Compositæ._ Seeds and division. =Wrightia=, Balfouria (Palay or Ivory-tree). _Apocynaceæ._ Seeds; usually by cuttings, which root readily in sand in heat. =Xanthoceras=. _Sapindaceæ._ Usually multiplied by seeds; root-cuttings are sometimes used. =Xanthorhiza=, Zanthorhiza. _Ranunculaceæ._ Seeds and suckers. =Xanthorrhœa= (Black Boy, Grass-tree). _Juncaceæ._ Seeds; but usually by offsets. =Xanthosoma=, including Acontias. _Aroideæ._ May be increased by cutting up the stem or root-stock into small pieces and planting these in light soil, or cocoa fibre, in bottom heat. After a stem has been cut off, a number of shoots are developed, which can be treated as cuttings. =Xerophyllum.= _Liliaceæ._ May be propagated by seeds and by divisions. =Xiphion.= See Iris. =Xylophylla.= See Phyllanthus. =Yam.= See Discorea. =Yellow-wood.= See Cladrastis. =Yew.= See Taxus. =Yucca= (Adam's Needle, Bear's Grass, Spanish Bayonet). _Liliaceæ._ Increased by seeds; and by divisions, which may be planted in the open ground, or by pieces of thick, fleshy roots, cut into lengths, and inserted in sandy soil, in heat. =Yulan.= See Magnolia. =Zamia.= _Cycadaceæ._