I have a whole mess of these in my pond. They flower in june usually. I reside in minnesota due east of the twin cities right on the wisconsin border. Having only lived here for about a year, I had not gotten around to looking about the pond. It is mostly swamp by late august and the pipewort grows in the slightly deeper portion past the cattails.Clear water, so I think there must be a small spring that provides just enough water to keep it from being entirely muck by summers end. I do not know if they are protected here or not or if protection applies to private land. Guess I should look it up. Most of the lakes around here seem to have them.