I am in the cold zone where winters get 20-40 below zero.
i just have a small pond-preformed that is only about 12" deep. I don't think it is deep enough to overwinter the water lillies, as it freezes solid ontop, and probably all the way to bottom. I tried leaving water hyacith in pond but they froze out and were soft and mushy next season. How does one store water lillies inside over winter. Or should i just attempt to leave it outdoors and see if it makes it?
This article was in the Q&A section of my website, hope it helps!...S
Q; How do I overwinter my pond plants?
* As the weather turns colder the underwater oxygenators should be cut back.
* Marginals should be cut back to about 50-70mm (2"-3")above water level, once the leaves and stems have turned brown.
* Remove dead leaves and flowers from water lilies.
* Floaters must be left to form their overwintering buds" which will sink to the bottom, but you can keep some of these buds in a jar of water indoors.
These will germinate early in the spring and if returned to the pond they will provide surface cover quicker than the buds left in the pond.
* Non-hardy aquatics need to be over-wintered indoors in water-filled containers