Rock Cotoneaster, Rockspray Cotoneaster
Horizontal Rockspray (Cotoneaster horizontalis) is a low-growing shrub with herring-bone structure. In Autumn the leaves begin turning bright-bright red, about the same time the green berries are ripening to an equally bright red.
Informal Upright, Slanting, Cascade, Semi-cascade, Literate, Group planting, Saikei
Can be grown in Sunny or shade position, but flowers best in full sun positions. Protect from frost if long cold spells are expected.
Water well keep moist but not wet and ensure that the plant does not dry out during the hotter summer months. During winter keep pot moist not wet. Dont water blossoms as they wilt easily.
Every two weeks during the growing season after they have flowered. In spring a earky summer use a balanced general purpose fertiliser, switching to a low nitrogen fertiliser late summer.
Leaf and Branch Pruning:
New shoots should be shortened to one or two leaves throughout the growing season. Heavier pruning should be done between late winter and spring. Do prune after mid summer as this will remove next years flower buds.
Re-potting & Growing Medium:
This is a fast growing species and younger plants need to be repotted every year between late winter and early spring. Use a using fast-draining soil 30% Loan, 30% Peat, 30% Sharp Sand. Remove upto to a third of the roots but do not bare-root. Chage the soil gradually by replcing all the soil in a small wedge at a time (wedge rotation).
Wire just before bud break in spring. Protect the bark when wiring. Do not leave wire on for more than one growing season at a time.
Cotoneaster likes to sucker, so if it is not being grown as a clump, suckers must be vigilantly removed to promote trunk growth. Cotoneasters lend themselves to mame and shohin, but are harder to grow as large bonsai.