12 Reasons Your Seeds Fail to Sprout --- and Foolproof Ways to Fix Them
8. Hard Seeds Need Scarification
🌰 Some seeds have impenetrable coats.
Methods:
Mechanical:
- 120-grit sandpaper
- Nail file scratches
Soaking:
- 24h in warm water
- 1h in weak acid (vinegar)
| Seed Type | Best Method | Examples |
|---|---|---|
| Thick-coated | Hot water soak | Morning glories |
| Waxy-coated | File notches | Sweet peas |