Red Salvia, Salvia greggii, also known as Autumn Sage, is a must have perennial for desert hummingbird gardens as it blooms profusely from spring through fall. Hardy in both Tucson and Green Valley down to zero degrees, Red Salvia appreciates some afternoon shade and moderate irrigation to perform its best. If planted in too much shade, it will flower much less.
The tiny leaves are lush green, so even when not in bloom it is an attractive plant. The mature size is about 3 feet tall and wide. If it starts to look leggy or scraggly, shearing to the ground will cause it to regenerate and become fuller in appearance. This is a long-lived perennial, eventually needing replacement, however, if shearing does not help.
Use Red Salvia along with other perennials for a colorful garden. Try Mexican Oregano, Penstemon species, along with other plants that prefer some shade such as lavender and chocolate flower.
Reference: Mountain States Wholesale Nursery and Gregg Starr Nursery Plant Info Sheet, 1999.