Here in Houston area the cost in time and energy to try to keep plants healthy is just to great and IME domed to failure.
What can work is to take suckers from healthy plants and replant.
I have found here that new seedlings that are healthy have a much greater chance of staying healthy for a longer time. So I pull everything on or about July 4 with the rare exception that a plant may have fruit still clinging on.
Michael
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