
GKH_Susan
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on November 5, 2020
It's hard to tell without seeing the plant, but I'm guessing it's suffering from pythium root and/or stem rot. You may need to sterilize your plant's soil. Here's a helpful article:
https://www.gardeningknowhow.com/ornamental/flowers/begonia/begonia-root-knot-nematodes.htm
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