Little Walnut Tree

Little walnut (*Juglans microcarpa*), also called Texas walnut, is a deciduous large shrub or small tree native from the southwestern Great Plains into Texas and northern Mexico. It has a rounded crown, pinnately compound leaves, and unusually small walnuts; its scale and form vary with site and climate. ## Identification and landscape character Oregon State University describes plants about 20–50 feet tall, usually branched near the ground, with a broad crown and yellow autumn foliage. The male flowers occur in catkins, while female flowers develop at branch tips; the small fruits have a hairy husk and a very small edible seed. Oklahoma State also notes its tree form and small, marble-sized nuts. This native walnut can be considered where a regionally adapted, deciduous tree or large shrub is appropriate. ## Growing conditions The species occurs across a range of dry and semi-arid regions. Oregon State lists it as hardy to USDA Zone 7 and very heat tolerant, while Oklahoma State notes that it is somewhat intolerant of shade. Plant in a sunny site with room for a mature crown. The species can resemble Arizona walnut (*J. major*) where their ranges meet, so use botanical identification when the distinction matters. ## Sources [Oregon State University Landscape Plants: Juglans microcarpa](https://landscapeplants.oregonstate.edu/plants/juglans-microcarpa) · [Oklahoma State University: Little Walnut](https://extension.okstate.edu/programs/plant-id/plant-profiles/little-walnut) ## Maintenance Water during establishment and extended drought, then adjust to local rainfall and soil conditions. Remove damaged or crossing branches while the tree is young. Avoid pruning heavily once the crown is established, and collect fallen nuts if they are unwanted in paths or lawn areas.