What is cold moist stratification?

Most milkweed species planted in North America need a cold moist stratification to encourage spring germination. Cold moist stratification is a technique used to simulate the real-world conditions a seed would receive outdoors after the frozen winter gives way to a warm, wet spring.

In respect to this, what does it mean to cold stratify?

Definition of Cold Stratification: Pre-treating seeds (cold stratification) is a simple measure you can take which will break a seed's dormancy causing the seed to be more ready to germinate.

What seeds need cold stratification?

The following are some common plants requiring a cold treatment for seeds:

  • Butterfly bush.
  • Fuchsia.
  • False sunflower.
  • Hardy hibiscus.
  • Catmint.
  • Evening primrose.
  • Perennial sweet pea.
  • Rudbeckia (black eyed susan)

How do you stratify seeds?

Mix seeds with damp sand (not dripping wet), place in a labeled, sealed plastic bag and store in warm (about 80°F) place for 60–90 days. Then place in refrigerator (33–38°F) for 60–90 days before sowing. Or, sow outdoors and allow one full year for germination.

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