Wurmbea

Four species. Greenhouse and half-hardy bulbous perennials. Offsets. Sandy peat and loam.

Wych Elm

Ulmus montana.

Xanthoriza

Xanthoriza apiifolia. Hardy evergreen shrub. Suckers. Common soil.

Xanthorrhaea

Six species. Green-house evergreen shrubs, or herbaceous perennials. Offsets. Loam and peat.

Xanthosia

Xanthosia rotundifolia. Greenhouse evergreen shrub. Cuttings or seeds. Loam, peat, and sand.

Xanthoxylum

Fourteen species. Stove and green-house evergreen and hardy deciduous trees and shrubs. Ripe cuttings. Common soil.

Xeranthemum

Three species. Hardy annuals. Seeds. Light rich soil.

Xerophyllum

Four species. Hardy herbaceous perennials. Division or seeds. Peaty soil.

Ximenesia

Five species. Hardy annuals and biennials, and green-house herbaceous perennials. Seeds. Common soil.

Ximenia

Two species. Stove evergreen trees. Cuttings. Loam and peat.

Xiphidium

Two species. Stove herbaceous perennials. Division. Loam, peat, and sand.

Xiphopteris

Two species. One a stove, the other a green-house perennial. Division or seeds. Loam and peat.

Xylomelum

Xylomelum pyriforme. Greenhouse evergreen tree. Ripe cuttings. Loam, peat, and sand.

Xylophylla

Eleven species. Stove evergreen shrubs. Ripe cuttings. Loam and peat.

Xylopia

Three species. Stove evergreen shrubs. Ripe cuttings. Loam and peat.

Yellow Sultan

Centaurea sua-veolens.

Yellow-Tailed Moth

See Bombyx.

Yew Tree

Taxus.

Yucca

Adam's Needle. Thirteen species. Hardy, stove, and green-house evergreen shrubs, and a few hardy herbaceous perennials. Y. pendula, a variety of Y. aloifolia, is a hardy deciduous tree. Suckers. Light rich soil.

"Cut the flower-stem off Yucca glori-osa directly it has done flowering, and take away all the suckers, except two or three of the strongest. Then remove a little of the soil round the bottom of the plant, and replace it with a dressing of equal parts of sandy loam and cow-dung." - Gard. Chron.

Zamia

Twenty-one species. Stove or green-house herbaceous perennials. Suckers. Light sandy soil.

Zebra Plant

Calathea zebrina.

Zephyranthes

Eleven species. Green-house and half-hardy bulbous perennials, and a few hardy and half-hardy herbaceous perennials. Offsets. Turfy loam, peat, and sand.

Zexmenia

Zexmenia tagetiflora. Half-hardy herbaceous perennial. Seeds. Common soil.

Zichya

Three species. Greenhouse evergreen twiners. Young cuttings. Sandy loam and peat.

Zieria

Ten species. Green-house evergreen shrubs. Young cuttings. Sandy loam and peat.

Zigadenus

Five species. Hardy herbaceous perennials. Division or seeds. Peaty moist soil.

Zilla

Two species. Half-hardy evergreen shrubs. Cuttings. Light rich soil.

Zinziber

Ginger. Thirteen species. Stove herbaceous perennials, except Z. miega, which belongs to the green-house. Division. Loam, peat, and sand.

Zinnia

Eight species. Hardy annuals. Seeds. Rich mould, or common soil.

Zizia

Three species. Hardy herbaceous perennials. Division or seeds. Moist soil.