Thymeguard --which is some sort of a concentrated oil made from Thyme-- sounds quite good and also rather scary. One thing I read appears to say that it is indiscriminate in what it kills. Do you have experience with Thymeguard? Do you recommend using it? In general, I think that using teas and oils from aromatic herbs should be a good thing. I've currently got buckets of homemade Nettle tea, Comfrey tea and Horsetail tea ready to spray in a few days.
John Bunker, Palermo Maine