After reading many ways to try and keep Water Hyacinth over winter I tried
the following:

1. Placed a plant in a quart jar in a sunny window. Kept water topped up.

2. Placed a plant in a floating tub under grow lights from 7am to 11pm.

3. Placed a plant in a net bag and sunk to the bottom of the pond. 4 feet.

Result. - They all died.

Too bad.

Heather