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I am not too sure what you mean of "floating garden" here exactly? I know of "floating villages" and "floating treatment pods", see here on the SuSanA discussion forum for Cambodia:
https://forum.susana.org/forum/categories/179-flooded-areas-and-islands/4057-floating-treatment-pods-for-lake-communities-in-asia-wetland-works-ltd-cambodia-a-constructed-wetland-system-for-floating-communities-and-flood-prone-land-based-communities#4057
We also have this sub-category for flooded areas: https://forum.susana.org/forum/categories/179-flooded-areas-and-islands
Wikipedia has this information about floating gardens (in Mexico): https://en.wikipedia.org/wiki/Chinampa