When I'm working in the Water Lily Pond, quite a few visitors talk to me, "how floriferous the water lilies in Kobe Kachoen are! My water lily never produces a single flower at all.....". When I ask them if they've ever repotted it, most people say no.
Almost all the water lilies in the Garden are tropical species and its cultivars, that are different from hardy water lilies that are grown by ordinary people. But anyway, I'll try to be helpful;on this issue, I'd like to give you a brief instruction of how to repot hardy water lily.
The season of hardy water lily repotting is early to mid spring, and it corresponds to the season of cherry blossom in Japan. First of all, let's remove the plant from a pot.
You can see numerous growth points(in red circles on the above picture). Leaving this state causes the nutrient to disperse each growing points and prevent the water lily to bear a bud.
Cut the root stock into about 10-15cm long, leaving a single growing point for each of them.
Heavy soil is suitable for water lily. Put soil and water in a container, and temper the soil well to turn as elastic as an earlobe.
Put the tempered soil in a pot about 18cm in diameter, and bury pellets of fertilizer(in red circle) at a distant point from the root stock. Then place the root stock in a pot, and bury it with the soil;please be careful NOT TO BURY THE GROWING POINT.
After all these, sink the pot into the water.
Hardy water lilies are less floriferous than tropical water lilies, but with proper care it is never the case that a plant bears only one or two flowers a year, except for very special varieties. Please repot every year, expose in full sun, and fertilize well during growing period. If nothing goes wrong, that'll result in numerous flowers.
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