The Valley Oak grows into the largest of North American oaks. It ranges over the hot interior valleys of California where there is a water table within reach of the roots. Valley Oaks grow quickly, reaching 20 feet in 5 years, and 40 feet in 10 years, and up to 60 feet in 20 years. Its pewter-colored rippled bark adds to the attractive aesthetic of this species. Valley oak tolerates cool wet winters and hot dry summers, but requires abundant water.