1 lb worm castings are made from 100% organic matter. Fantastic for bioactive terrariums or for your hermit crabs/ plants! Hermit crabs love this!!! Put in a small dish and watch them go crazy for this ? Hermit crabs enjoy worm castings because they contain beneficial microbes and high-quality minerals like calcium and magnesium. You can add worm castings to a hermit crab's tank by sprinkling them around, putting them in a supplement dish, or adding them to a regular dish. 1-2 tablespoons for use in house plants can feed them for up to 6 months! You can also sprinkle these in your garden. These worm castings are good for almost all plants as they contain a variety of minerals and nutrients which are ready to be absorbed by the plants. You can use worm castings for your container plants, flower beds, lawn, herbs and more. These castings are small batch/ double sifted from my own little worm farm ?These are Red Wiggler castings from very cared for worms