Jerusalem Thorn (Parkinsonia aculeata)

Jerusalem Thorn

Parkinsonia aculeata

Feathery foliage dances in wind, a desert work of delicate resilience. Deciduous small tree; common names: Jerusalem Thorn, Mexican Palo Verde.

Full sun
1/week
Beginner
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Plant Needs

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Sunlight Requires full sun exposure; tolerates intense desert heat and reflected sunlight from hardscaped surfaces
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Watering Drought-tolerant; water deeply but infrequently, allowing soil to dry completely between waterings to prevent root rot
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Temperature Hardy to short-term light frosts; thrives in hot, arid conditions with low humidity
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Characteristics

  • Leaf: Bipinnate, feathery bright green leaflets that fold during drought or at night
  • Flower: Bright yellow pea-shaped blooms with orange throats, clustered in racemes
  • Stem/Bark: Green photosynthetic bark; sharp paired spines at leaf nodes
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Care Guide

Watering

Water deeply every 1–2 weeks during active growth to support flowering

Fertilization

Diluted low-nitrogen feed once every 2 months. Use a balanced, slow-release fertilizer sparingly to avoid excessive vegetative growth

Eggshell powder topdress:Crush dried eggshells into fine powder; scatter lightly on soil surface and water in to release calcium gradually; avoid overapplication to prevent pH imbalance
Pruning
  • Remove dead or damaged branches in late winter to improve airflow and maintain shape
  • Trim suckers at the base to prevent overcrowding and preserve the tree’s form
  • Avoid heavy pruning, as the green photosynthetic bark supports energy production during drought
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA-verified non-toxic to cats; no reported toxicity

Humans: Non-toxic to humans; no known adverse health effects from ingestion or contact

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental landscaping for arid gardens; erosion control in semi-arid regions; provides food and shelter for desert wildlife