Overwintering tropical water lilies is a different kind of gardening activity. You can do it if you follow a few simple rules.
Before the first frost, remove the roots from the pots.
Trim off most of the leaves and roots so the roots will fit into a one gallon (roughly six inch) pot.
Repot in fresh soil.
Put in aquarium where the water temperature is never allowed to go below 68F
Direct grow light lighting kept no more than six inches above the water line.Usually we’re looking for several hundred watts. In other words, at least two large bulbs or grow lamp tubes.
If the tropical water lilies do not grow but instead form walnut sized tubers, you can remove the tubers and store in water that goes no lower than 55 to 60 F for the winter. Alternately, you can keep them in wet vermiculite at these temperatures until spring.
When placed in small pots in the spring and installed in 72F water, they will (hopefully) start to grow again.
Grow for at least one month in gallon pot before putting out into pond.
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