I plan on having an ongoing theme,"Future of Food", which anticipates the ways humanity will deal with the basic necessity of nourishing itself.
In many ways, for us to create new ideas to move forward, we have to take inspiration from the past. One civilization that also used the idea of floating gardens were the Aztecs of Mexico. It was an aquaponic system, meaning farming was done in conjunction with a water system using fish & their waste as fertilizer.
I saw this modern concept for a massive floating garden on a barge-like vessel. They are called smart floating farms & are harvestable ecosystems unto themselves.