Tanoak Tanbark-oak

You recognize Tanoak by its distinctive acorn-bearing evergreen form, narrow leaves resembling oak, and spiky seed cups unlike any true oak, found on coastal and montane slopes from southern Oregon through California. This native tree marks the transition zone between oak woodland and conifer forest.

Tanoak grows 40-75 feet tall in sun to part shade with moderate water needs and adaptable soil tolerance (zones 8a-9b). Fast-growing and long-lived, it suits large woodland plantings and native gardens. Unfortunately, Phytophthora ramorum (sudden oak death pathogen) now seriously threatens this species; the species is at high risk in regions where the disease is established. Monitor for various leaf spots and cankers. No serious insect pests documented.