Kentucky Coffeetree (Gymnocladus dioicus)

Kentucky Coffeetree

Gymnocladus dioicus

Its bold, bipinnate leaves bring prehistoric grandeur to landscapes. Deciduous tree; common name: Kentucky coffeetree.

Full sun
1–2/week
Moderate
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Plant Needs

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Sunlight Full sun to partial shade; thrives in open, sunny locations; tolerates urban pollution
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Watering Drought-tolerant once established; water deeply during dry spells, avoid overwatering to prevent root rot
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Temperature Extremely cold-hardy; tolerates hot summer temperatures; adapts to continental climates
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Characteristics

  • Leaf: Large bipinnate compound leaves (up to 1 m long); bright green, turning yellow in fall; bare branches in winter
  • Flower: Greenish-white, fragrant racemes; dioecious (separate male and female plants)
  • Stem/Bark: Thick, rough gray-brown bark; stout, ascending branches with sparse foliage
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Care Guide

Watering

Water deeply every 7–10 days during prolonged dry periods

Fertilization

Apply balanced slow-release fertilizer once in early spring. Avoid over-fertilization to prevent excessive foliage growth at the expense of structural strength

Composted banana peel tea:Use fully composted banana peels steeped in water for 24 hours; dilute 1:20 for root drench to support healthy foliage and root development
Pruning
  • Remove dead or damaged branches in late winter to minimize disease risk
  • Thin crowded branches to improve air circulation and maintain the tree's natural open canopy
  • Avoid heavy pruning; only trim to remove crossing or low-hanging branches for safety
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; ingestion may cause vomiting, diarrhea, lethargy

Humans: Seeds and inner bark contain cytisine alkaloid; ingestion causes gastrointestinal distress and potential respiratory issues

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Garden Uses & Culture

Culture: Symbolizes strength and resilience in North American native landscape design

Usage: Ornamental shade tree; historical use of roasted seeds as a coffee substitute (raw seeds are toxic)