How Do I Divide Asclepius Tuberosa, Butterfly Weed?

Question

It has a very deep taproot

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Answer 1

It is best not to divide it, but propagate from seeds or stem cuttings. Here is more:

https://monarchwatch.org/milkweed/prop.htm

You can collect seeds in the wild with permission or order them from online wildlife friendly nurseries. Many big box stores carry asclepias tuberosa seeds or asclepias incarnata seeds with their other seed packets in the stores in spring and summer.