Overview
Cork Oak Bonsai (Quercus suber) is a Mediterranean oak famous for thick corky bark and small evergreen leaves. It is best suited to rugged old-tree styles, informal upright and literati designs. For UK growers, treat it as: Outdoor with frost protection in UK bonsai pots.
Placement
full sun and good airflow
Watering
water thoroughly then let the top begin to dry; avoid winter waterlogging
Feeding and fertilising
feed during spring and summer
Pruning and wiring
clip back extension growth; avoid removing all foliage from weak branches
Repotting
repot every 3-5 years in spring with conservative root pruning
Propagation
acorns or collected nursery material
Pests, diseases and common issues
root disturbance, mildew, scale and frost damage in shallow pots