its nettles trust me i see this stuff at least 3 times a week have used it and have been stung for more than enough time to know. you are going to want to look for the plants that have not flowered yet as they contain the richest nutrients. topping the younger plants actually does them well just like cannabis. the older leaves work but they also create this new chemical that is not good for eating and may cause liver problems ive used a lot, not sure on its effects with plants i doubt it does anything.