Re: Help! Banana leaves are turning yellow (and growth is stunted)
Pictures would greatly help and you didn't describe the pot used.
My guess is the soil is too wet and soggy in the bottom of the pot. Start by repotting the plant in a mix with 50% perlite. Make sure the pot has drain holes and a saucer. Put something under the pot to keep the drain hole above any water in the saucer.
It's likely root rot has set in, the roots should be white. If not, trim the black roots off and clean the corm with bleach water to kill the rot. After repotting it will take a month or 2 before seeing any new. growth.
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