Thanks for your question.

I’ve grown basil for many years and have learned one critical lesson. It is a plant very susceptible to root rot. This occurs far more commonly in basil than in many other plants. I suspect that this is what has happened with your basil. The prolonged rains and soggy soil have caused rotting in the roots. This impairs the ability of the roots to take up water. This in turn leads to leaf wilting and in your case, detrimental effects in the leaves.

Usually the situation does not improve by leaving the plant in the soil. I would suggest the following:

1). Cease watering the plant immediately to prevent further damage.

2). Carefully lift the basil out of the garden bed. Be gentle to avoid damaging the roots further.

3). Inspect the roots. Healthy roots are white and firm. Roots affected by rot will be brown, black, mushy, and may have a foul odor.

4). Using clean, sharp scissors or pruning shears, cut away the rotted roots. Be sure to remove all the affected parts, cutting back to healthy tissue.

5). Rinse the roots under lukewarm running water to remove any remaining soil and fungal spores.

6). Replant the basil, ensuring the soil is loose and well-draining.

7). Water the basil lightly and only when the top inch of soil feels dry.

Be patient. Depending upon the severity of the fungal infection that led to the initial rotting, your basil may or may not recover.

Good luck. Thanks for consulting us.