in Tucson, Phoenix,
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Prosopis hybrid: Hybrid Mesquite / Chilean Mesquite

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Form: Tree.
Leaf retention: Semi-evergreen in regions without freezes. Deciduous in hard freezes.
Growth rate: Moderate to rapid.
Mature Size: 20-40' high and wide.
Flowers: Yellow to cream colored, small, bottle brush shape.
Bloom: Spring.
Fruit: Seed pod, flat and curved, compressed around seeds, sometimes with rolled edges.
Leaves: Small dark green leaflets, closely spaced, with feathery appearance. Some cultivars have dense crowns. Provides moderate to dense shade.
Stems: Thornless to thorny, depending on cultivar.
Roots: Nitrogen-fixing*.
Wildlife: Attracts bees.
Toxic / Danger: No.
Origin: South America.

Cultivation and Uses
USDA hardiness zones: 8-11, depending on cultivar.
Heat tolerant: Yes.
Drought tolerant: Yes.
Sun: Full sun.
Water after becoming established: Deep water every two months during drought. Always water past the drip line of the tree and away from the trunk to encourage lateral root development. Water encourages crown growth and mesquites without sufficiently wide roots can be blown over by strong winds.
Soil: Well drained, dry, low in organic content, pH 6.6-8.5 (neutral to alkaline). *Do not use a nitrogen fertilizer.
Prune: In winter, remove lowest branches to train into a tree. Also thin crown by removing any inward- or downward-pointing branches. Do not prune more than 20% of crown or root growth will be slowed. Without periodic thinning, heavy wind damage may occur. This is a high maintenance tree.
Litter: Moderate to high, depending on cultivar. Seedpods may stain concrete.
Propagation: Seed.
Uses: Ornamental, shade.

This tree is sometimes sold as South American Hybrid Mesquite. Several cultivars are bred by nurseries and vary in appearance and behaviour.

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Prosopis hybrid: Hybrid Mesquite / Chilean Mesquite - flowers

Prosopis hybrid: Hybrid Mesquite / Chilean Mesquite - seed pods

Prosopis hybrid: Hybrid Mesquite / Chilean Mesquite - leaves