The Saturday Question: Organic Pesticides and Herbicides–What Have You Tried?

I’m all about organic gardening. In fact, even since I became a homeowner in 2004, I’ve managed to use completely nontoxic methods. Now that I’m in my new place, however, I have a problem: aphids. My new yard features about fifty-five rose bushes, and a couple of them happen to be bug-magnets. I tried an organic spray, which does get rid of the aphids–but also turns the leaves strange colors. I’ve bought bags of ladybugs, but they didn’t seem to stick around long enough to do much good. For now I’m just keeping my eye on the aphids and cutting off the leaves and blossoms they congregate on. Any other solutions?