Milkweed Seed Germination Protocol | Ernst Conservation Seeds

Milkweed Seed Germination Protocol

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Under favorable growing conditions (warm soil, adequate moisture and light), a fairly high percentage of milkweed seed in any given lot may not germinate immediately after planting.

The reason the seed does not germinate is that there is an incorrect balance of two hormones within the seed, and this leads to a condition called seed dormancy. To “break” this dormancy and get high levels of germination we employ a process called seed stratification. The protocol we use to stratify milkweed seeds prior to planting in our greenhouse is as follows.

    • In a Ziploc® baggie mix three to five volumes of Quikrete Play Sand® brand sand with every volume of seed. We recommendthis brand of sand as we have found the grain size to be very uniform.
    • Moisten the sand/seed mix with tap water so that it looks like wet sand at the beach.
    • Seal the baggie and place into a refrigerator, but not the freezer, for up to three months.
  • After three months of stratification, your seeds will be ready to plant.
    • For planting in a greenhouse, we recommend using a potting soil that is designed fortransplant production. It may be labeled “plug” or “germination” mix with the primarycomponent being peat moss.
    • Take a pinch of the sand/seed mix that has five seeds and plant it on top of each cell orpot being planted.
    • Cover the sand/seed mix with a layer of vermiculite or sand that is just thick enough tocover the seed.
    • The number of days from planting to germination will depend upon greenhousetemperatures. Temperatures in the 70’s to low 80’s will result in faster germination thantemperatures in the low 50’s or 60’s.

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DISCLAIMER: The information in this review of practices is the result of more than 50 years of experience in seed production. Ernst Conservation Seeds has been supplying seeds and consulting in the reseeding of tens of thousands of acres of roadsides, surfacemined lands, conservation and restoration sites in eastern North America, as well as growing and supplying seed and consulting in the planting of hundreds of thousands of acres of CRP/CREP-related areas for erosion control and wildlife habitat. All of these practices are opinion only and our best advice as a result of these experiences. These recommendations do not cover all of the conditions that will be encountered in the field. All of the information is for individual consideration. Ernst Conservation Seeds is not responsible for conditions that will be encountered in individual situations. The use of brand names does not represent our endorsement of a specific product; rather, it represents our experience only and has not necessarily been replicated in peer-reviewed research. The use of chemical pest control agents is subject to manufacturers’ instructions and labeling, as well as federal, state and local regulations.
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