Yes. Water lettuce and water hyacinth can be overwintered indoors, but for most pond owners, replacing them in spring is easier and more economical.
These tropical floating plants require warm water, strong supplemental lighting, and regular care throughout the winter.
If you choose to overwinter them
For the best chance of survival:
- Maintain water temperatures around 70–80°F (21–27°C).
- Keep the surrounding air temperature around 70°F (21°C) or warmer.
- Provide approximately 10–14 hours of strong full-spectrum lighting each day.
- Keep water lettuce leaves above the water and avoid continually wetting the leaves.
- Remove yellow, damaged, or decaying leaves.
- Maintain clean water and avoid overfertilizing.
- Inspect plants for insects, snails, algae, and other unwanted organisms before bringing them indoors.
For most pond owners, replacing water lettuce and water hyacinth each spring is the simpler option.