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Worm Gro Earthworm Castings

A premium organic soil supplement made from earthworm castings (vermicompost). Use in soil, in containers, or to brew worm tea for plants and lawns.

Key features:

  • Premium earthworm castings (vermicompost) for natural plant nutrition
  • Mix with native soil, use in containers, or brew as worm tea
  • Helps plants resist disease and pests
  • OMRI Listed and CDFA registered organic input

Available size:

Verify against live page
g&b worm gro

Nature's Most Efficient Plant Food

Gardner & Bloome Organics Worm Gro Earthworm Castings is a premium organic soil supplement created through the natural digestive process of earthworms, often called vermicompost. The castings are concentrated, plant-available nutrition that has been processed by living organisms, which is exactly what soil microbes recognize and use.

You can mix Worm Gro with your native soil, add it to your container mix, or use it to brew “worm tea” by steeping the castings in water for a nutrient-rich liquid feed. When applied at the drip line, it helps plants resist disease and pests while increasing beneficial microbial activity in your soil. Use it on a wide variety of plants, flowers, vegetables, and lawns.

How to Use Worm Gro Earthworm Castings

  1. In Your Native Soil: Mix into the planting hole or amend an existing bed by working into the top few inches of soil.
  2. In Containers: Add a layer of castings to your potting mix when planting or repotting.
  3. As Worm Tea: Steep a scoop of castings in a bucket of water overnight. Strain and use the liquid to water plants.
  4. At the Drip Line: Sprinkle castings around the drip line of established plants and water in.

Product Specifications

Bag size: Verify against live page
Form: Vermicompost (earthworm castings)
Best uses: Plants, flowers, vegetables, lawns, worm tea
Certifications: OMRI Listed, CDFA Organic Input Material registered
Ingredients: Vermicompost (earthworm castings)
Regional Availability: AZ, CA, HI, ID, OR, NV, UT, WA

Safety Data Sheet:

Key Benefits:

Plant Food the Way Plants Recognize It

Earthworm castings are pre-digested by living organisms, which is what soil microbes know how to use.

Three Ways to Apply

Mix it into the bed, layer it into containers, or steep it in water to brew worm tea.

Plants That Stand Up to Pressure

Builds the microbial activity that helps plants resist disease and pests on their own.

Third-Party Verified Organic

OMRI Listed and CDFA Organic Input Material registered, so the organic claim is independently checked.

All of our products are listed by the Organic Materials Review Institute (OMRI), the leading non-profit, internationally recognized third party accredited by the USDA’s National Organic Program (NOP).

That means every ingredient and every process that goes into making our products has been verified 100% compliant as organic, all the way to the original source. Look for the OMRI logo on the bag, ensuring every product is proven organic.

At G&B Organics, we’re always looking for ways to source ingredients and produce our products as locally as possible to our customers.

This reflects our commitment to sustainability, and to investing in local economies and businesses whenever possible.

Find Worm Gro Earthworm Castings at a Store Near You

Available at independent nurseries and garden centers in AZ, CA, HI, ID, OR, NV, UT, and WA.