Worm castings are the best! Mix them into your soil, top dress, make a fancy aerated tea, pasteurize them and apply, and/or apply as a raw tea. Worm castings contain high levels of nutrients and humates, as well as being host to a plethora of microbiota, which will help your rhizosphere to be healthy and productive. Also, one of my favorite benefits of worm castings is their water retention. One of the first things you will notice after applying worm castings is that your soil will stay moist for a longer period of time. This is usually a good thing in the heat of the summer, but can be a problem in cold and wet climates.