Losing battle to the thistles...
I've spent the last 9 months or so clearing, tilling, and prepping several acres of long-unused farmland in the hopes of turning it into an organic farm and nursery. Mostly, it's gone pretty well (though many hard lessons learned on the way), but I have a few large (1/2 acre+) patches that are completely dominated by Canada Thistle.
So, I'm thinking now that there just isn't much option but to hit them with some chemicals. Most of these fields are slated for perennial crops and nursing, and I just can't plant them without killing the thistle first (especially in the nursing fields...I can't sell plants that have thistle in their roots).
I'm hoping some of the knowledgeable organic folks will be able to give me some advice on this. First, I'm planning on certifying as much land as posible as organic, as soon as possible (I'm guessing not for 3 years anyway, as I have no records or treatments before I moved in). So, I'm guessing that If I'm going to hit the thistles with something, it's best to do it now and get it over with.
The question is really just this: what to use? I really don't have a lot of experience using such chems, and I'm not sure wether I should try starting with roundup, or just go ahead and use the nastiest, most lethal chemical I can find? (The nature conservancy's ESA goes into a fair amount of detail on both of these approaches.) I'd kind of like it to be a quick kill, so that I can get a cover/forage crop in by fall, and begin turning my fields into an organic farm.
BTW, I'm posting here rather than in another forum because I'm guessing you guys will be more understanding of the urgency of returning the fields to organic treatment ASAP. Didn't want to post it in discussions because it's not really an OG question (or is it?). Advice and/or moral support would be most appreciated!