Black Ironwood (Krugiodendron ferreum)

Black Ironwood

Krugiodendron ferreum

Its dense, hard wood resists decay, a quiet sentinel of dry coastal habitats. Evergreen hardwood tree; common name: Black Ironwood.

Full sun
1/week
Moderate
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Plant Needs

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Sunlight Full sun to partial shade; tolerant of coastal salt spray and dry, windy conditions
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Watering Drought-tolerant; water deeply only during prolonged dry spells, avoid overwatering to prevent root rot
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Temperature Tolerates mild frost down to 10°C; thrives in warm subtropical to tropical daytime temperatures
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Characteristics

  • Leaf: Small, leathery, elliptical leaves with glossy dark green upper surfaces and pale undersides
  • Flower: Tiny, fragrant white to cream-colored clustered flowers
  • Stem/Bark: Dark brown to black, deeply furrowed, extremely dense and hard wood
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Care Guide

Watering

Water deeply every 7–10 days during extended dry periods

Fertilization

Apply slow-release low-nitrogen granular feed once at the start of growing season. Avoid high-nitrogen fertilizers, which can promote excessive foliage growth at the expense of woody development

Eggshell powder topdressing:Crush dried eggshells into fine powder; sprinkle lightly on soil surface to boost calcium levels without burning shallow roots
Pruning
  • Remove dead or diseased branches in late winter to maintain tree structure and airflow
  • Thin crowded interior branches to reduce pest and disease risk
  • Avoid heavy pruning, as the slow growth rate delays recovery
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: No known toxicity to cats

Humans: No known toxicity to humans

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Garden Uses & Culture

Culture: N/A

Usage: Dense, hard wood used for tool handles and decorative woodworking; planted as a coastal windbreak