Answer: If you've fixed the drainage problem, your tree fern should recover. Standing water will exclude oxygen, which roots need. As long as it was only a few days and not a few weeks, the roots should recover. (Think about the saturated soils in the hurricane prone regions and how the trees recover after prolonged flooding.) There's not much else you can do to help your tree fern along. If it was healthy going into this mishap, it should pull through. Best wishes with your garden!
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