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Cypripedium reginae was for many years in my old bog garden. 2020 in spring I transplanted it in a new setup. The original 2 olants had made two seedlings.Not jet flowering. These flowered this year.Growth was slow but good in the past years. But in the new setup with continuous water supply it seemingly exploded.It is so dense I will have to make three out of it.first picture 2020second 2021
The advantage of floating substrate is, that there is always a very thin layer of water there, which is always saturated with oxygen and anaerobic microorganism have no chance. It is not the water supply alone. Excess water flows always into the main water body without much organic material.Your setup has varying oxygen levels, which I try to avoid without much maintenance.The quite excessive water body will keep for month without intervention or rain and if it rains no water will suffocate the substrate.