Tree Blog

Quercus gravesii | Coastal Southern California

Here can be seen a long new growth extension on Q. gravesii. It is commonly observed that the color of new growth on an oak can be a preview of the fall/winter color that an oak will provide later in the year. The coloration process in a leaf is a layered affair, with the green of the chloroplasts being added last. They are also the first to be withdrawn, as the tree recycles the vital pigments and chemicals that make photosynthesis work. Withdrawing the chloroplasts reveals the underlying color of the leaf.

Dave Muffly