I also do pretty much the same thing that Jonathan does by adding 1 pond tab fertilizer per pot per month. I grow mine in small round pre-formed ponds. As well as some smaller water pots and even a coffee cup. I always have tadpoles and lots of small fish in the ponds because everything breeds like crazy! LOL! I started out with 8 fish and now have too many to count. I got the fish in April. They actually swim in schools in the ponds! LOL!
Water lilies growing in coffee cups:
My pre-formed ponds:
