Ostrya

Hop-hornbeam. Two species. Hardy deciduous tree. Seed and layers. Common soil.

Otanthus

Otanthus Maritimus. Hardy herbaceous. Cuttings. Sandy loam.

Othouna

Twenty-six species. Green-house evergreen shrubs, herbaceous, and bulbs, except 0. tagetes, an annual. This is increased by seed, and the others by cuttings, division, or offsets. Light rich loam.

Ox-Eye

Bupthalmum.

Ox-Eye Daisy

Chrysanthemum leucanthemum.

Ox-Lip

Primula elatior.

Oxyanthus

Oxyanthus speciosus. Stove evergreen shrub. Young cuttings. Loam and peat: abundant watering.

Oxybaphus

Twelve species. Chiefly hardy and half-hardy trailers and creepers. Seed. Common soil.

Oxycoccus

Cranberry. Three species. Hardy evergreens. See American Cranberry.

Oxylobium

Ten species. Greenhouse evergreen shrubs. Young cuttings. Loam, peat, and sand.

Oxypetalum

Oxypetalum appendiculaturn. Stove evergreen twiner. Cuttings. Peat and loam.

Oxyria

Oxyria reniformis. Mountain sorrel. Hardy herbaceous. Division. Common soil.

Oxystelma

Eseulentum. Stove evergreen twiner. Cuttings. Peat and loam.

Oxytropis

Twenty-eight species. Hardy herbaceous alpines. Seed. Sandy loam and peat.

Oxyura

Oxyura chrysanthemoides. Hardy annual. Seed. Common soil.

Oyster-Shells

See Animal Matters.

Ozothamnus

Three species. Green-house evergreen shrubs, probably hardy. Young Cuttings. Loam and peat.

Pachidendron

Seven species. Green-house tree aloes. Suckers and leaves, slightly dried. Sandy loam and calcareous rubbish.

Pachypodium

Two species. Green-house deciduous succulents. Cuttings, slightly dried. Sandy turfy loam and peat.

Pachyrhizas

Pachyrhizas angulatus. Stove evergreen twiner. Tubers, seed, and cuttings. Rich light loam.

Pachysandra

Pachysandra procumbens. Hardy herbaceous; and P. coriacea, stove evergreen shrub. Division or suckers. Common soil.

Paederia

Paederia fatida. Stove evergreen shrub. Cuttings. Rich light loam.

Paederota

Two species. Hardy Alpine annuals. Seed. Sandy loam.

Palafoxia

Palafoxia linearis. Green-house herbaceous. Seed and division. Common soil.

Palicourea

Three species. Stove evergreen shrubs. Cuttings. Sandy loam and peat.

Paliurus

Two species. Hardy deciduous shrubs. Seed, root cuttings, and layers. Common soil.

Panaetia

Panaetia fulva. Green-house annual. Seed. Sandy loam.

Pancratium

Twenty-nine species and many varieties. Chiefly stove and green-house bulbs,butP. illyricum, and P. maritimum are hardy. They are propagated by offsets, and new varieties raised from seed. They thrive best in a compost of three-fourths sandy loam and one-fourth leaf mould. Take up the hardy species in autumn, separate the offsets, and replant immediately about four inches deep in a light, well drained sheltered border, putting some mulch or six inches of coal ashes over them during the winter.

Pandamus

Twenty species. Stove palms. Seed or suckers. Rich light loam.

Panning

Panning is forming a pan or basin in the soil round the stem of a tree or shrub in which to pour water.