As marijuana is legalized in more places, here s how to grow your own. If you d rather have more control over the eventual location of any new butterfly weed plants, you can remove the seed pods from the plant before they burst open and simply plant new seeds by hand instead. As of 2023, per country.  Source: <a href=http://smart2water.com/division-of-agriculture-noxious-weed-seed-laws/>http://smart2water.com/division-of-agriculture-noxious-weed-seed-laws/</a>