Good suggestion, I did put some small chunks of evergreen fertilizer
spikes in my lily pots just before the snapping turtle decided they
needed to go. Three potted lillies, I put 1, 1/2" sized chunk in each
pot. The pond had started to get a little cloudy and I put a little
0-0-22 in for my hyacinth, the pond was greening up sverely the very
next day and has been green ever since. This has been probably at LEAST
a month ago though.