Overview
Oak Bonsai (Quercus species) is a strong character tree with rugged bark, lobed leaves and a powerful ancient look. It is best suited to informal upright, literati, windswept and naturalistic old-tree styles. For UK growers, treat it as: Outdoor.
Placement
full sun and open airflow
Watering
water thoroughly when the surface begins to dry; avoid stale wet soil
Feeding and fertilising
feed in spring and early summer; avoid forcing coarse growth on refined trees
Pruning and wiring
prune in late winter or early spring; reduce strong shoots gradually and preserve weaker buds
Repotting
repot every 3-5 years in early spring with conservative root work
Propagation
acorns, air layering or collected young trees with permission
Pests, diseases and common issues
powdery mildew, caterpillars, leaf scorch and root disturbance