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I have three potted sweet Basil plants in my backyard. Two of them look great, but the middle one is a lighter green color and has browning and curling leaves. I live in zone 6. I grew them from seed. They're in a partly sunny location. I water when they're dry and fertilize with Miracle Grow periodically. We've had a spell of cooler weather (3 weeks or so) and that seems to be about when it started. Any ideas? I'm a bit at a loss since the other two plants look fine.

.three basil plants browning basil leaves basil stems curling browning basil leaves

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Mildew due to over watering- and keep the area underneath the plants clean of dead leaves- this will encourage other problems in too if not treated. pick off affected leaves or even remove affected plants completely. there also seems to be a slight touch of scorch on the leaves and possible slug damage due to dead leaves encouraging them in- overly wet conditions?

  • I wondered if it wasn't too wet. I haven't been watering that often, but they haven't been drying out because of cool weather and rain. Thanks for your help! – lspare Aug 20 '17 at 19:34
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I would try will less fertilizer (and changing the soil). The soil seems very rich (too much), so i think roots could have some mushroom problems.

  • Thank you! I'll just give it water once it's dry for a while and see if that helps. – lspare Aug 20 '17 at 19:34
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Looks like herbicide damage. Any chance the soil in that pot came from a different source ?

  • Nope, all from the same bag of potting soil. Thanks, though. – lspare Aug 20 '17 at 19:32

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