Potted roses love pond water. I've always tried to do that for my potted roses. At the tail end of the drought this summer, my big pond dried up completely. I could keep the small ones filled, but the big one would have taken too much of our dwindling water supply to fill. Now the rains have filled it to the brim, so I have to throw a few plants and mosquito fish into it. The frogs are happy to have their pond back. They sing songs of joy every evening.