Why Coral Trees (Erythrina) May Not Set Seed in Cool Climates

Two 15-year-old coral trees in Christchurch, NZ, flower but produce no seed pods. The likely cause: insufficient summer heat.

Climate Mismatch

Erythrina crista-galli is native to Brazil and needs a long, warm period for pod maturation. Christchurch’s cool summers (even without frost) may allow flowering but not seed development. Lack of a specific pollinator could also contribute.

Next Steps

• Consult a local nursery or agricultural extension agent.
• Hand-pollinate flowers if pollinators are absent.
• Accept that seed set may only occur in exceptionally warm years.

The trees are otherwise healthy; enjoy their blooms.