Zygophyllaceae
Coulter's Lignum Vitae (Guaiacum coulteri)
Guaiacum coulteri
Extremely drought-tolerant once established. Requires full sun, infrequent watering, and excellent drainage. Very slow grower — pruning is not recommended. Ideal for hot, arid garden settings.
Every 14 days
Direct sun
-3° - 45°C
20% - 60%
Categories
What is Coulter's Lignum Vitae?
Coulter's Lignum Vitae (Guaiacum coulteri) is a medium-care plant from the Zygophyllaceae family. Coulter's Lignum Vitae (Guaiacum coulteri) is a slow-growing evergreen tree native to western Mexico and Guatemala. Renowned for producing the world's densest and hardest wood, it bears stunning violet-blue flowers in spring and summer. Highly drought-tolerant once established, it thrives in full su...
Coulter's Lignum Vitae grows up to 7.6m, with spread of 762cm, watering every 14 days, -3°C – 45°C, 20–60% humidity. It is not suitable for indoor environments and safe for pets.
Unlike many popular species, Coulter's Lignum Vitae is safe to keep around pets.
How to Care for Coulter's Lignum Vitae?
TLDR: Coulter's Lignum Vitae needs Direct sun, watering every 14 days, and temperatures between -3-45°C with 20-60% humidity.
How Often Should You Water Coulter's Lignum Vitae?
Water every 14 days during warm months, allowing soil to dry completely between waterings. Reduce to monthly in winter. Never overwater — root rot is the primary risk.
How Much Light Does Coulter's Lignum Vitae Need?
Plant in full sun (6+ hours/day). Inadequate light causes leaf drop and stunted growth. Avoid shaded locations entirely.
What Is the Best Soil for Coulter's Lignum Vitae?
Use gravelly, sandy, or rocky well-draining soil low in organic matter. Alkaline pH (7.0–8.5) preferred. Avoid heavy clay or waterlogged conditions.
What Pot Should You Use for Coulter's Lignum Vitae?
Large terracotta or stone pot (promotes drainage and provides stability). Ensure adequate pot size to accommodate the extensive root system.
Care Schedule
Fertilize
Every 90 days
What Is Coulter's Lignum Vitae and Where Does It Come From?
Coulter's Lignum Vitae (Guaiacum coulteri) is a slow-growing evergreen tree native to western Mexico and Guatemala. Renowned for producing the world's densest and hardest wood, it bears stunning violet-blue flowers in spring and summer. Highly drought-tolerant once established, it thrives in full sun and well-drained soils, making it ideal for xeriscape and low-maintenance gardens in warm climates.
How to Propagate Coulter's Lignum Vitae?
Seed Propagation
Use seeds less than 1 month old for best germination rates. Seeds lose viability quickly after harvest.
- 1 Remove the red aril coating from fresh seeds
- 2 Soak seeds in water for 24 hours until swollen
- 3 Plant in sandy, well-draining substrate
- 4 Keep moist but not waterlogged in a warm, sunny spot
- 5 Expect germination in 4-8 weeks
Materials needed:
How Big Does Coulter's Lignum Vitae Grow?
TLDR: Coulter's Lignum Vitae can reach up to 7.6m tall with Slow growth rate.
Max height
7.6m
Spread
7.6m
Growth rate
Slow
Foliage
Evergreen
Plant Uses
Ornamental
Great for decoration
Medicinal
Medicinal properties
Medicinal Uses
- Anti-inflammatory for arthritis and rheumatism
- Expectorant for sore throats
- Natural diuretic and laxative
- Traditional diabetes treatment among the Seri people of Mexico
Is your plant showing symptoms?
Click on the symptom to discover possible causes:
What Diseases Commonly Affect Coulter's Lignum Vitae?
TLDR: Coulter's Lignum Vitae is susceptible to 1 known diseases. Monitor regularly for early detection.
Meaning & Symbolism
Symbol of endurance, longevity, and strength. Its wood — the densest in the world — represents resilience and perseverance across cultures.
Fun Facts
Guaiacum wood is the densest in the world — it sinks in water rather than floating
It was so prized in 16th-century Europe it became known as Lignum Vitae — Wood of Life
It grows only 2-5 cm per year, making it one of the slowest-growing trees in the Americas
The Seri people of Mexico have used its berries medicinally for centuries
Frequently asked questions
How often should I water Coulter's Lignum Vitae?
Can Coulter's Lignum Vitae grow in a container?
Is Coulter's Lignum Vitae toxic to pets?
Why are the leaves dropping?
When does it flower?
Compare with similar plants
| Attribute | Difficulty | Light | Watering | Pet Safe |
|---|---|---|---|---|
| Flamingo Flower | Medium | Partial shade | 5d | ⚠️ |
| Prayer Plant | Medium | Partial shade | 3d | ✓ |
| Boston Fern | Medium | Partial shade | 3d | ✓ |
| Weeping Fig | Medium | Partial shade | 10d | ⚠️ |
