Worm Castings package front
Worm Castings package front

Potting Soils

Organic Worm Castings

Our organic worm castings are the earth’s richest natural fertilizer. For millions of years, earthworms have continued the “Cycle of Fertility” by converting organic matter into vermicompost. Our organic worm castings let you take advantage of this natural and sustainable way to enrich soil and stimulate growth for all kinds of plants.

Available in:

  • 12 quart Bags
  • 1 cubic foot Bags
  • 1 cubic yard Bulk Bags
  • Bulk Worm Castings

Vegetable Gardens
Till in 1/2″ of worm castings or top dress with 1″ of worm castings around plants. Re-apply 1/2″ of worm castings every 3 to 6 months.

Potting Mix
Mix in 1 part of worm castings to every 4 parts of potting soil.

House Plants & Flower Beds
Apply 1/2″ of worm castings at the beginning of spring, summer & fall; till in worm castings if possible.

New & Established Lawns
Apply 10 pounds per 100 square feet. Water lawns as usual.

Fruit Trees
Apply 1/2″ – 1″ of worm castings under half the diameter of the trees canopy. Till in if possible.

Plant Tea
Mix 2 cups worm castings with 5 gallons of water. Let steep for 1 hour and feed plants.

Earth Work Castings

Revitalizes Soil

Helps worn-out soil and come alive by adding beneficial microorganisms, nutrients, and organic matter.

Promotes Plant Growth

Significantly increases microbial life in the root zone and stimulates plant growth more than any natural product on the market.


An all-in-one soil amendment that is odorless and safe for the environment, children, and pets.

Natural Fertilizer

Our Products are Organic

CDFA seal

Heritage Organics complete line of soil amendments and potting mixes are based on many years of research, field trials and work with commercial growers.

Our Organic Earthworm Castings are fertilizing material registered through the Organic Input Program to be used in organic crop and food production. They are verified to comply with the California Fertilizing Materials Law and Regulations and USDA National Organic Program Standards.


Frequently asked questions

Information regarding the contents and levels of metals in this product are available here.