Oregon Urban Tree Catalog

Quercus ilex HOLM OAK

BROADLEAF

EVERGREEN

FULL SUN

NATIVE

HIGH DROUGHT TOLERANCE

H: 40FT W: 20FT

Holm oak, or holly oak, is native to the Mediterranean and now naturalized along the West Coast. This tree features dense, leathery green leaves that are spiny when young and smooth with age. Small acorns enclosed in scaly cups provide a food source for wildlife. Holm oak grows at a moderate rate, typically adding 8–12 inches per year. It thrives in challenging conditions, including coastal salt spray, shade, and urban pollution. It plays a crucial role in truffle cultivation, forming a mycorrhizal relationship with fungi such as the prized French black truffle which cannot grow without this symbiotic connection.

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