The Screwbean Mesquite, Prosopis pubescens, is a little known species of mesquite for desert landscaping, even though it is a native to the Southwest deserts. The Screwbean Mesquite matures to a smaller tree or large shrub than the Velvet Mesquite, making it suitable for smaller spaces. Hardy down to zero degrees, it is a good choice for both Tucson and Green Valley.
The unique feature about this species of mesquite, is the unusual bean pods. Shaped a little like a corkscrew, the pods are decorative both on the tree, and for use in crafts.
Like all mesquite species, the Screwbean Mesquite loves lots of water provided there is good drainage, but it will survive on far less and still look good. This tree requires diligent pruning to make a tree form, but once accomplished you will have a nice looking tree with interesting shaggy bark.
Reference: Mountain States Wholesale Nursery and Gregg Starr Nursery Plant Info Sheet, 1999.