john Saltveit wrote:When I added ag lime/calcium, my buttercups slowed down.
john Saltveit wrote:However, and PERHAPS more importantly, buttercups are so incredibly powerful here in the PNW because they are dynamic accumulators of calcium. We tend toward low calcium soils here in the PNW due to heavy rainfall, which perhaps you've heard about. In addition, buttercups and other ranunculae are very unlikely to be in the same family as your vegetables, fruit, or mushrooms, and so biodiversify your yard, adding an entirely different set of microbes to the soil food web and assuring that a balance of soil life will not allow one powerful disease to take over your whole yard. Pulling out the leafy parts before flowering adds that organic material to your yard, which is full of calcium and improves the heavy clay (Willamette Valley) or sand (Puget Sound) so that food grows better.
After I added ag lime to my soil, buttercups weren't wiped out. They just became so much less aggressive which is fine by me. Just make sure you look closely before you eat parsley, burnet salad, or earth chestnut leaves, because you don't want to eat a poisonous buttercup by mistake.