Cold Stratification – Tips from Prairie Moon

The Prairie Moon catalog had an interesting article on cold-stratification. Here are the basics.

  • 1/3 cup silica sand – you can find this at some hardware stores or pet stores. It’s different from regular sand
  • Add and mix 1 to 2 tsp of water so that the sand will clump into a ball.
  • Add seeds – 1/8 ounce.
  • Make a note as to how long the seeds need to be refrigerated.
  • Put mixture into a plastic bag which can be sealed. Mark the bag ahead of time with the type of seeds and the dates.
  • Put the bag into a refrigerator.
  • Mark your calendar to take the seeds out of the frig.
  • Plant outside when they danger of frost is past.

The Prairie Moon Catalog tells you how long you need to do cold-stratification for each plant. Here are a few examples.

  • Echnacea – no pre-treatment necessary.(Germinates in 2-3 weeks)
  • Most native milkweed – 30 days
  • Liatris – 60 days
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