You are doing it all wrong. The right way to prune basil for a huge bushy look

Basil is a warm-season herb, and its growth slows down as temperatures drop. In cooler climates, it’s important to adjust your pruning schedule as the season changes. As fall approaches, reduce the frequency of pruning to allow the plant to conserve energy.
If you’re growing basil indoors during the winter, continue to prune regularly, but be mindful of the reduced light levels. Provide supplemental lighting if necessary to maintain healthy growth. In all seasons, monitor your plant closely and adjust your care routine as needed.

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