Water Locust (Gleditsia aquatica)

Water Locust

Gleditsia aquatica

Its thorny branches frame riparian quietude, a tough wetland sentinel. Deciduous tree; common name: water locust.

Full sun
2–3/week
Moderate
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Plant Needs

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Sunlight Full sun to partial shade; thrives in open riparian environments and tolerates occasional shade
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Watering Tolerates standing water and periodic flooding; avoid prolonged drought stress
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Temperature Hardy to USDA zones 5–9; withstands cold winters and hot, humid summers
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Characteristics

  • Leaf: Pinnately compound, 15–30 cm long; oval glossy green leaflets that turn yellow in fall
  • Flower: Small greenish-yellow fragrant racemes; dioecious with separate male and female trees
  • Stem/Bark: Gray-brown bark with paired sharp thorns up to 10 cm long on young branches
  • Fruit: Flat twisted pods 15–30 cm long containing hard, toxic seeds
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Care Guide

Watering

Keep soil consistently moist; tolerate temporary flooding

Fertilization

Apply balanced slow-release fertilizer once at bud break. Avoid high-nitrogen fertilizers to prevent excessive foliage growth

Composted banana peel tea:Steep fully composted banana peels in water for 24 hours; dilute 1:20 with water for root drenching to support fruit and root health
Pruning
  • Remove dead, damaged, or crossing branches in late winter before new growth emerges
  • Trim lower thorny branches to improve pedestrian safety
  • Thin crowded inner branches to enhance air circulation and light penetration
  • Avoid heavy pruning, as it stimulates dense, thorny new growth
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic due to seeds; ingestion may cause vomiting, diarrhea, and abdominal pain

Humans: Raw seeds contain lectins; ingestion causes gastrointestinal distress

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Garden Uses & Culture

Culture: N/A

Usage: Riparian erosion control, ornamental shade tree for wetland gardens