Hi I am trying to take control of a relatively large area of thistle without herbicides. I am cutting off seed heads (and bagging) and then I want to chop and drop or pile the rest of the plant. I have several different varieties of thistle. I'm wondering if leaving the plant on the ground is OK. I'm also wondering if immature flowers or seed heads could also just be cut and left on the ground. I am planning to cut plants to the ground every month or six weeks during the growing season. Do you think this is effective control (long term) I am by Smith Rock state park. thank you for any advice you have.