As they grow, there is water that floats the roots dangle in the water, or water level. Best growth and flower stems flush with water or over water. If the water is shallow roots, some may be completely based on the ground under water. Smaller water plant often float freely. They tend to have a large part of the plant changed to a float to prop up, floating plant, such as the early portion of the shaft the water hyacinth has a swell buoys (buoyancy leaf) there are stems that slug vegetables inside the hollow is a big air. Help sustain the floating plants.
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