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.
- False sunflower.
- Hardy hibiscus.
- 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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