Those plants both need pretty good drainage. You might consider fixing that so you have better options for plants to grow in that site. This may mean directing rainwater away from the spot with berms or trenches if it is a low area where rainwater collects after a rain. Building up a large raised planting area is also a good option. This gets the base of the plant and some roots up out of the soggy conditions. Finally there are ways to drain away soil moisture using subsurface pipes (French drains) that work sort of like a septic system in reverse. The water goes into the pipes from the and then moves off to a lower area where it drains from the pipe.
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