Hedge

A row composed of living plants usually in a straight line and planted closely to each other (See Plate XV, Page 95).

Hedgerow

A hedge or fence of bushes or shrubs either in the form of a definite hedge or of an irregular border-planting, of varying width and oftentimes varying types of plants.

Heeling-in

Placing plants with roots covered with soil pressed down with the heel or toe to preserve them in a dormant condition for short periods until they can be permanently planted. Usually a deep furrow is dug, the roots placed close together in the furrow, with stems in a slanting position, and roots then covered with soil. The soil used in this covering is taken from the furrow of the next row (See Plate VI, Page 34).

Herb

A plant with no persistent stem above ground.

Horticultural Variety

Said of certain varieties of plants developed because of some desirable characteristic. They are not necessarily hybrids, but usually are artificially hybridized, then propagated by grafts, buds, cuttings, etc., to preserve in the new plant the desirable characteristics of the parent, which might be lost if grown from seed.

Host Plant

A living plant attacked by a parasitic fungus or supporting a parasitic plant.

Hotbed

A bed of earth enclosed in a glass-covered frame and heated by means of fermenting manure placed well below the surface of the soil in the hotbed

Humus

Vegetable mould or partly decayed organic matter in the soil.

Hybrid

A cross between two species of the same genus or two varieties of the same species.

Hybrid Tea

A section of the Hybrid Perpetual group crossed back upon the tea-scented China rose. They have a lighter green and less wrinkled foliage than the pure Hybrid Perpetual. They are generally less hardy but more continuous in bloom than Hybrid Perpetuals, sometimes blooming from June until frost.

Hybrid Perpetual

Or Hybrid Remontant roses have a stiff upright growth, dull wrinkled foliage, and large flat flowers generally of dark colours. They embrace generally the characteristics of the Provence, Damask, French, and Chinese groups. They mostly have only one season of bloom, in June, but sometimes give scattered bloom later on in the season.

Hybridization

Cross fertilization between plants of different varieties or species and sometimes of different genera.

Hydrated Lime

The compound formed by the action of water or steam on fresh burned lime. Its good physical condition makes even distribution possible, and thus permits maximum effectiveness to be obtained.

Indigenous

Native and original to the country in which the plant is growing.

Land Plaster

Is a sulphate of calcium compound and its tendency is to make a soil sour. It should not be considered as a means of correcting soil acidity.