Last year the pond looked a little bare. Over this past winter the clover really took off. I didn't plant it, it came from the aldabran pen, which is next to the pond. Notice the filter, that big black tub on the right. The top of that tub is about 3' high. This a.m. as I was walking past it I saw a little frog in there. How on earth did a frog get in that filter? There is an occasional frog in the actual pond, but the turtles eat them, and there are never any frog eggs in there, let alone poly wogs.