I bought three plants in April when it was kinda cool still. I put them in my goldfish/albino catfish pond and around june they started to grow. Nothing major at first, now here we are in the middle of June and I am throwing them out about every other day. They are about the size of a butter bowl, but then they shoot off this little arm and another plant starts to grow off of that. Doesnt sound to ferocious until you forget to take some out in about a week and the little ones and thier little ones have all grown arms and now the plant is about the size of a hula hoop. But hey, just reach and grab some and throw them out, no big deal. If your in an area where it freezes in the winter, they will die off anyhow and you just scoop them out. Give them a shot if you want something to take over an area and cover it fast.