California black walnut
Beautiful, deciduous tree native to riparian areas in Northern California. Canopies of pinnately compound leaves form a round-topped tree 20 - 60 ft. tall. Flowers in early spring are dangling catkins, followed by round nuts in a fleshy husk. The delicious nuts are small and held in thick, hard to crack shells. An important food source for wildlife. Prefers deep soils and is drought tolerant once established. A natural for along the upper slopes of creeks and rivers.