Growing Coral Trees (Erythrina) from Seed in Hot Climates

Coral Tree Basics and Seed Germination

Coral trees (genus Erythrina) are tropical to subtropical legumes known for brilliant red flowers and striking seed pods. They thrive in USDA zones 10–12, but roots can survive in warmer parts of zone 8. In Las Vegas (zone 9a), winter cold is the limiting factor, not summer heat.

Seed Preparation and Sowing

1. Scarify: Nick or file a small section of the hard seed coat to allow water uptake.
2. Soak: Place seeds in warm water for 24–48 hours, changing water if it becomes cloudy.
3. Sow: Plant ½ inch deep in a well‑draining potting mix.
4. Provide warmth: Keep at 70–80°F (21–27°C) with consistent moisture.
5. Germination: Expect sprouts in 1–3 weeks.

Growing in Las Vegas

• Plant in a sheltered microclimate (south‑facing wall, courtyard) to minimize winter cold exposure.
• Use containers that can be moved indoors or to a heated garage during freezes.
• Water regularly in summer; reduce in winter.
• Fertilize with a balanced, slow‑release fertilizer during the growing season.

With scarification and warm conditions, coral tree seeds germinate readily. While Las Vegas summers are ideal, winter protection is essential for long‑term survival.