Fragrant violet-blue flowers in terminal clusters create a wonderful display in spring against the backdrop of shiny dark green foliage. This multi-stemmed evergreen is excellent for use as a large shrub or small tree. Slow growing and easily trained as espalier or a patio tree. This desert native thrives in warm, sunny, arid environments. USDA Zone 8-11. Full sun. Once established, water occasionally; more in extreme heat or containers.