Breaking Seed Dormancy: Science Methods

Why Seeds Are Dormant

Seed dormancy is an evolutionary adaptation preventing germination at the wrong time. Seeds have physical barriers (hard coats), chemical inhibitors (abscisic acid), or physiological immaturity that must be overcome before they'll sprout.

Cold Stratification

Many temperate species require cold, moist conditions to break dormancy. Mix seeds with damp vermiculite, seal in a bag, and refrigerate at 35–40°F for 4–12 weeks. This mimics natural winter conditions. Species requiring this include milkweed, echinacea, lavender, and many native wildflowers.

Scarification

Seeds with hard, impermeable coats need physical or chemical damage to allow water uptake:

• Mechanical: Nick the coat with a file or sandpaper
• Hot water: Pour 190°F water over seeds, soak 12–24 hours as it cools
• Acid: Commercial growers use sulfuric acid (not recommended at home)

Light Requirements

Some seeds require light to germinate (lettuce, petunias, snapdragons). Surface-sow these and do not cover with soil. Others require darkness (phlox, calendula).

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