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The lake is about 25 km across and 40 km long. Hjälmaren. I own a tiny bit of it. I try to grow nymphaeas in an area inside the thick expanse of reed (Phragmites communis). I have cleared an area close to the shore.Sometimes a glorified rat called Castor fiber visits and has the rhizomes for dinner. I have an adjacent pond that the rats do not enter. There I have most of my plants in pots - normal plastic pots. and a few in the bottom mud.Those that must be taken out like the on in the tub, I put at the bottom of that pond.The pond is deep enpough so there is no frost at the bottom.I have found out the hard way that most of the popular lore about how to grow nymphaeas is rubbish.The special "nymphaea clay" sold in garden centers will kill them. Good fat garden soil grows them well.Normal plastic pots are perfect - no need to use baskets.It is meaningless to try to wane newly bought plants by moving them slowly to deeper waters. Young leaf stalks will elongate from the full depth in a couple of days old leaves die off quickly anyway.The do need sun, however - at least half day.If the pond freezes all way down they usually die.Go out and get some fols they are good and beautiful plantsCheersGöte
Göte,The big problem I have with growing them in pots is that unless you have something heavy in the bottom of the pot the waterlily roots end up weighing less than water due to their oxygen content, and the pots start to float or turn over.