Another good rosemary for the Tucson and Green Valley areas is the variety Rosmarinus officinalis ‘Tuscan Blue’. This is a medium sized shrub, reaching about 4 feet tall and up to 6 feet wide. Rosemary is from the Mediterranean, which is why it handles our desert climate fairly well.
Rosemary can handle full sun, but will accept afternoon shade as well. It must have good drainage, or may rot out. Rosemary is drought tolerant, and can survive on minimal water, but if the leaves start to yellow, it is probably not receiving enough.
The Tuscan Blue Rosemary is excellent for cooking. Not all Rosemarys taste good. The two most common varieties used in cooking are the Tuscan Blue and the Prostrate, or Trailing varieties.
Other shrubs for full sun to consider are the Texas Ranger, Texas Mountain Laurel and the Bush Dalea, all cold hardy and suitable for both Tucson and Green Valley.
Reference: Mountain States Wholesale Nursery and Gregg Starr Nursery Plant Info Sheet, 1999.