Quercus douglasii - Blue Oak
Quercus douglasii is the dominant white oak in much of the Coast Ranges and Sierra Foothills surrounding the Central Valley of California. The blue leaves make Quercus douglasii a valuable component of the native garden. Quercus douglasii typically grows to 30 feet tall and somewhat wider than tall but can get significantly larger in the right conditions. The natural shape of the tree is quite pleasing when the trees are deciduous. The Blue Oak is slow growing. To plan for slow growing trees, I often plant faster growing plants with the intention of removing them as the more valuable slow growing tree finally grows into its space. Quercus douglasii is tolerant of heavy soils. The Blue Oak is quite drought tolerant and even drought insistent once established. Quercus douglasii is found below the elevations that heavy snowfall occurs. Quercus douglasii is a host for the Mournful Duskywing butterfly and the Western Tussock Moth Caterpillar.
High resolution photos of Quercus douglasii are part of our garden image collection.