Tree Blog

Quercus polymorpha x alba | Central Valley

The set of Monterey Oak (Q. polymorpha) hybrids growing in a nursery in the central valley, showed an array of traits, though they are all clearly related. They appear as if siblings. We know that Monterey Oak in central California is a semi-evergreen species, and what we see here is very late fall color, occurring in December. The red-purple coloration is utterly atypical of Monterey Oak in habitat, giving further suggestion of hybridization. The timing of leaf change, and coloration, are suggestive of paternity with a deciduous species with red fall color.

Dave Muffly