Our worm castings and humic acid are produced in Nebraska and are an all-natural, organic source of nutrients. They add microbial life and moisture holding capabilities to soil. Worm castings are Mother Nature's purest form of sustained release plant food. This product can be used on all plants without fear of burning even the most delicate plants, including cactus. Humic acid increases the efficiency of your fertilizers, transforms insoluble nutrients into usable ones, retards pathogenic fungi build-up, and stimulates microbial activity.