• Bulk worm castings supersack
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Bulk Worm Castings

Bulk Worm Castings

$675.00
$675.00
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Shipping calculated at checkout.

Freight bulk worm castings for wholesale buyers, growers, and landscapers. One supersack holds about 2 cubic yards (roughly 2,250 lb) of pure OMRI Listed (kwf-5814) Sweet Leaf castings in an industrial woven polypropylene bag with four lifting loops.

$675 per supersack. Freight is calculated at checkout based on your delivery address, or contact info@sweetleafsoil.com to arrange delivery to your dock or yard.

Lab reports: A&L Great Lakes compost analysis (sampled Aug 2025: moisture 51.8%, pH 5.8, soluble salts 1.01 dS/m) and Eurofins pathogen and metals COA (Aug 2026).

✓ OMRI Listed (kwf-5814)  ·  Made in Wisconsin  ·  Lab-Tested

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OMRI Listed (kwf-5814)  ·  Made in Wisconsin  ·  Lab-Tested

Cheap compost vs. Sweet Leaf castings

Drag to see the difference. Sweet Leaf worm castings are screened, odor-free and consistent. Not a bag of mystery mulch.

Cheap compost vs. Sweet Leaf castings
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What's inside

Straight Worm Castings

Adds Organic Matter

No Fillers or Manure

OMRI Listed (kwf-5814)

Odor-free and easy to use

Odor-free and easy to use

Odor-free, screened castings that add organic matter to potting mixes, beds and top-dressings.

Why Sweet Leaf?

  • Adds Organic Matter

    Worm castings add organic matter to potting mixes, beds and top-dressings. Our 2025 lab sample measured about 53% organic matter on a dry basis.

  • Odor-Free

    No ammonia. No manure smell. Easy to use indoors, in the garden or in the greenhouse.

  • Soil Structure Builder

    Castings add organic matter that helps improve soil structure in beds and potting mixes.
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Questions, answered

How much do I use?

Mix 1 part Sweet Leaf castings to 4 parts potting soil, or top-dress with a quarter-inch layer and water in. For existing plants, apply 1 to 2 tablespoons around the drip line monthly.

Can I use it on edibles?

Yes. Sweet Leaf castings are OMRI Listed (kwf-5814) for organic production and can be used on vegetables, herbs, fruit, and other edible plants. No synthetic additives.

Is there a smell?

No. Unlike raw manure or compost, properly processed worm castings are virtually odorless. You can use them indoors without any unpleasant smell.

How long does a bag last?

A 5 lb bag covers roughly 20 to 30 houseplant top-dressings, or makes about 10 quarts of amended potting mix at 1 part castings to 4 parts soil. Store bags sealed and cool, and use within 12 months of production.