Hi - I don't know anything at all about Permaculture. I saw it on the Gardening boards and my curiousity led me to join the mailing list. But, I do have some information on RoundUp weed killer. Here, in the States, I've had no less than 3 veterinarians warn me that no matter how safe RoundUp says it is, it has been proven that it is the NUMBER ONE cause of LEUKEMIA in dogs.