Parkinsonia florida (Blue Paloverde)

One of the most popular trees for desert gardens, Parkinsonia florida (Blue Paloverde) is a small, graceful tree with a short blue-green trunk and a loose, spreading crown. The foliage of small pinnately compound blue-green leaves is absent most of the year in response to dryness. However, photosynthesis is performed by the smooth, spiny, blue-green branches and twigs. In spring, masses of bright golden-yellow flowers, 2-4 in. across (5-10 cm), cover the entire tree, and the spectacular floral show may continue until midsummer, in response to summer rainfall. Rich in nectar, the flowers attract hummingbirds, bees, as well as many other insects. They give way to bean-like seed pods, 2-3 in. long (5-7 cm), that are valued by birds and mammals. Long-lived (up to 150 years old), fast-growing, drought-tolerant, Blue Paloverde is a great tree for gardens where its architectural qualities can be admired. This desert plant is also useful for erosion control. Showstopping in bloom, great-looking year-round, Parkinsonia florida is the state tree of Arizona.

• Grows up to 20-25 ft. tall (6-8 m) and 15-20 ft. wide (4-6 m). Adds about 36 in. per year (90 cm).
• A full sun lover, this plant is easily grown in dry to medium, loamy or sandy, neutral to alkaline, well-drained soils. Supplemental watering encourages faster growth but may result in weak limbs and shortened life span. Drought-tolerant once established.
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• Virtually pest and disease-free. Keep an eye out for palo verde root borers.
• Prune as needed to reinforce the structure and form of the tree. Can be pruned at any time, but caution should be used due to the spines.
• Propagate by scarified seeds.
• Native to Arizona, California, Nevada and Mexico.