Tree Blog

Quercus x jolonensis | Stanford Dish

Interestingly, even as true Blue Oaks are having trouble reproducing, their hybrids with Valley Oak (Quercus lobata) have been found to thrive. Where Blue Oak grows with Valley Oak, a hybrid called Jolon Oak is commonly found. If you compare the symmetry of the first Blue Oak presented here, then look at the craggy beauty of an old Valley Oak, then you can perhaps see hints of Valley Oak in this tree, which may be a true Blue Oak, or a mild hybrid with Valley Oak.

Dave Muffly