Scarifying Coral Tree Seeds: What "Nick the Seed" Means & How to Do It

"Nick the seed" means scarification—physically breaching the hard seed coat so water can enter and trigger germination. For coral tree (Erythrina spp.), it's essential.

How to Scarify

1. Knife method: Hold seed with pliers. Use a sharp knife to make a shallow slice (1–2 mm) in the seed coat—just deep enough to reveal the white endosperm. Do this on the side opposite the hilum (attachment scar).
2. Sandpaper method: Rub seed gently on medium-grit sandpaper until the coat thins or a small patch wears through.
3. File/nail clipper: A small notch with a metal file or clipper works for larger seeds.

After Scarification

• Soak in tepid water 8–24 hours. Seeds will swell.
• Sow 1 inch deep in well-draining mix.
• Keep warm (75–85°F / 24–29°C). Germination in 1–3 weeks.

Why Your Seed Didn't Sprout

Without scarification, the impermeable coat blocks water indefinitely. In nature, fire, abrasion, or animal digestion does the job. In cultivation, you do it.

Detailed Reference

Excellent guide: Seed Stratification & Scarification (University of Saskatchewan).

One small nick makes all the difference. Your Malibu climate is perfect for coral trees once they're up.