Mark, last year I had the same problem with pole bean plants. This year I had my first strawberries almost ready to go and they got chewed and it looked just like yours. I wired a mouse tap to the strawberry pot and got a mouse the first night!Something with small teeth ate my third little cucumber growing in 5 gallon bucket. Rabbit, mouse or squirrel. Lil peckers leave the leftovers in the driveway at night.
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My recommendation put s mouse trap in your plants!