Hamamelis arborea.—This is quite hardy, but grows very slowly. It flowers in a small state, but not very freely. I have only had this plant for four years, but I think it will do very well, and should flower more freely when a bit larger.
Hedysarum multijugum.—Quite hardy. An attractive shrub, with spikes of reddish pea-like flowers in July and August. It increases freely from the root by suckers. Thin and cut back the shoots in spring.
Helianthemum vulgare (Rock Rose).—There are many garden varieties of this, both double and single, the single sorts being the most attractive. They are quite hardy on a warm and sunny rock garden.
Hydrangea paniculata.—Hardy. A splendid low-growing shrub, flowering in autumn. A group of this, with a few plants of Prunus Pissardi cut hard back every spring to keep them small, is very effective, and the group can be carpeted with Lily of the Valley or London Pride to cover the bare soil underneath. The shoots of the Hydrangea should be well thinned, and those left cut hard back in the spring. It well repays a dose or two of liquid manure in the growing season. The variety, grandiflora, is better than the type.
Hypericum calycinum (Rose of Sharon).—Grows well in half shade. It is a dwarf plant, very pretty, but perhaps too often seen. Useful for carpeting other shrubs.
Jasminum nudiflorum.—Best on a wall. Winter flowering (yellow) and very pretty when in bloom.
Jasminum officinale.—Requires a wall, but does well while young. It is not a very long-lived plant here.
Kalmia latifolia.—Very attractive pink flowers; hardy, and will do wherever Rhododendrons flourish.
Kerria japonica.—A pretty yellow-flowered shrub that increases rapidly from the root. The double-flowered variety is the most commonly grown.
Laburnum.—Too well known for description. L. Adami is curious and worth growing.