Yes, worming the plants! I got 1/2 or more bucket (5 gallon) of worms in worm dirt/castings from my farmers market worm guy. I am sifting through and trying to get at least a couple in each pot of basil near ready to come inside. And putting a few in other containers, in the ground beds.
In the spring (March-April), I plan to get a bucket or 2 or more of his castings or a potting blend and work in the large containers. As the plants show new growth can clean and freshen the top few inches. Most of the herbs don't want rich, but can stand some freshening when growing out of the winter rest.