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Black Worm Castings




Vermitechnology’s Black Castings™ has been one of the most popular worm castings products on the market for years and is well known in gardening circles for its consistently fine quality. Worm castings can be mixed into organic potting soil before planting to boost growth and sprinkled into transplanting sites to help reduce transplant shock. They can also be used as a top-dress fertilizer anywhere to improve plant health including, raised garden beds, vegetable gardens, around trees or shrubs, and even lawns. Packed full of beneficial microorganisms and organic nutrients, worm castings are favored by organic growers thanks to their amazing all-natural growth-boosting properties.

  • Black Castings are harvested from worms fed a high-quality diet, no horse, cow, or any other grazing animal manure.
  • Slow decompisition and complex worm casting compisiton prevents nutrient burn and reduces the frequency of application.
  • OMRI certified organic.

Your Garden's Success is our #1 Priority

HTG Supply is committed to providing you with the very best products, pricing and service in the industry. We will ship your order fast and discreetly packaged to protect your privacy. Buy with confidence knowing your HTG Supply purchase includes simple returns as well as lifetime product support. Call our team of real growing experts with your purchasing or product use questions, and we will be here to help!

See it for less somewhere else? Give us a call and we’ll beat any online competitor’s price!

Customer Service:  1-866-710-GROW (4769) | [email protected] | Hours: Mon-Fri 9:00 a.m. to 5:00 p.m.


Earthworms are vital to the soil. Their burrows allow air and water to flow, but more importantly, they digest organic matter and excrete it as worm castings, a vital component in fertile soil. Unlike chemical fertilizers, Black Castings™ will not burn plants or trees and are completely safe to handle. Black Castings also break down much more slowly than traditional fertilizers.

Many chemical fertilizers are loaded with huge quantities of quickly available nutrients, but plants can only absorb so much in a given period, meaning everything that the plant doesn’t use right away is wasted. Pure worm castings like Black Castings, on the other hand, break down much more slowly to feed plants only as needed, reducing waste, increasing efficiency, and making Black Castings very cost-effective.

Black Castings™

•  OMRI certified organic
•  Are produced by earthworms fed a high-quality diet
•  Add organic matter to the soil
•  Improve soil structure
•  Are not produced with yard waste
• Are not made with horse, cow, or any other grazing animal manure
•  Break down slowly, reducing the need for repeated applications



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