You can use worm castings in a variety of ways. They can be used on potted plants, directly in your garden when you plant, or as a foliar spray (when brewed into a compost tea). One of my favorite ways to use worm castings is as a side dressing. Simply place a handful of castings at your plant’s base, then water. Your plants will soak up tons of beneficial nutrients. It’s especially helpful when your plants are putting on fruit.