Is my pond water poisoned?
I've moved into a new house and just found a small pond under a yew tree and camellia bush. It was sludgy and green, and I have pulled out what must be years of fallen branches, leaves and flowers. The water seems clearer now, but very empty. Could the yew have poisoned the water for plant and wildlife? Should I try to empty it and start again? I'd love to create something that actually helps wildlife come and live with me!