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If you live in north America or Europe im pretty sure it grows basically everywhere. I am sure it grows in other places as well. Look in places that are like old lots, it likes places where there are not very many nutrients and where the soil may be packed down. It has a really long tap root so it likes those conditions. There is a plethora of information online about harvesting it. I believe you can buy the leaf in health stores, and maybe the flower too.

This is very helpful! Thank you very much for sharing!!