Last summer, I first tried growing basil in flats. It was a smashing success. Harvested often, I had lots of tender leaves to use in pesto and for flavoring. In contrast, the plants in the ground had their usual tough leaves, etc., although bees and other visitors enjoyed the flowers.
So this year, I duplicated the method. Fabulous, again. These flats are the multi-harvested one on the right, and the newly sown one on the left.