That reminds me of Chinmapa from Mexico! A chinampa is a floating garden built on a freshwater lake, made by making a raft of woven reeds, with stakes to keep it in place. Soil was placed down until it was above the waters surface.

This system eliminates the need for watering, and was successful in growing maize, fruit, tomatoes, amaranth, beans, chile, and flowers.

If anyone wants to learn more, there is a good video here: https://youtu.be/HJiTRh4EeTs