Don't forget that most ponds are deficient in potassium (K). It helps
solve the algae problem. Plants can't use nitrogen if they don't have
enough potassium. When I bring my pots up from the bottom of the pond,
I will add the potash and put spikes on the lilies. The Agsafe Aquatic
Spikes look good. I will try them. Thanks for the suggestion.
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18,000 gallon (17'x 47'x 2-4') lily pond garden in Zone 6
Cheers, Steve Henning in Reading, PA USA