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Water lettuce requires plenty of sunshine...
But in the wintertime, water lettuce has special needs. I presently keep my water lettuce and my water hyacinth in shallow plastic containers inside a greenhouse protected from frost and freeze.
Growing Water Lettuce Indoors
In cold winter conditions water lettuce can be wintered over indoors in a sunny window. However, it needs warmth and humidity. This can be accomplished with a Water Garden Light Box; such as the one pictured here. This light box was simply made with an aquarium located in a sunny window covered with clear plastic wrap (to keep in the humidity) and with mirrors inserted inside the aquarium to reflect the light. (The mirrors were scrap mirrors I obtained for free from a glass and mirror company.) The mirrors were inserted on the bottom and on the left and right sides of the fish tank. I tried growing water lettuce the following year without mirrors, and the plants did not survive.
A florescent light must be placed on top of the aquarium to create heat and humidity. A grow light can be used to replace the florescent bulb and can be purchased online or at any hydroponics store. .
Growing Water Lettuce Outdoors
In the wintertime, if water lettuce is grown outdoors in a pond, it needs to be protected from freezing temperatures and covered with plastic or a Hoop House. However, it will also need a fan to circulate the air to prevent mold and mildew.
Here are some helpful links about growing water lettuce:
How to Grow Water Lettuce
Build a Water Garden Light Box
If you have any questions or comments, please feel free to contact me at email@example.com