Q.Milkweed
How to keep the seedlings warm outside when it is frosty?
Downtoearthdigs
Answered on November 14, 2015
Milkweed seeds should be started either indoors or can be direct sown in the spring after danger of frost.
Here is a link with more information.
https://www.gardeningknowhow.com/ornamental/flowers/milkweed/growing-milkweed.htm
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