A nice big dogbane root harvested when dormant in the winter or very early spring can be divided into many root cuttings and two or three crowns each of which has the potential to produce a new plant. The roots run very deep. This one probably kept going at least several feet. We have never gotten to the end of one yet. Some patches will not bear the impact of harvesting root stocks well, in which case you can look for seeds in the fall. This one is from a healthy patch on a city lot where it is just a matter of time until it is replaced by a building.

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