I keep forgetting about fertilizing lilies. Ours live in 30" tubs
filled with 2" rock and also on the floor of the cement pond. It
would be an interesting experiment to fertilize the tub groups and see
about flowers. Mostly, we have avoided adding anything but potassium
to the pond, considering the fish to be the nitrogen adders.

How do your fertilizer stakes affect the general pond algae levels?