BuildASoil Bulk Worm Castings
This is the best bulk source of worm castings we have ever worked with, and we don't say that lightly after 13 years of sourcing material. The castings come in fresh, and it isn't unusual to find living worms still working through the totes when they arrive. That's a good sign you're getting a biologically active product rather than something that sat in a yard for a season.
Every batch is soil tested, and the results are consistent. You can review the actual numbers before you buy, so you're building with material you can stand behind. The castings run high in calcium and low in sodium, which is exactly what you want in a bulk casting going into living soil or compost tea. We don't know of another supplier testing bulk castings to this level. If you're buying by the yard, don't settle for an untested brand.
Bulk Specs
- 2 cubic yards per tote
- 900 lbs per cubic yard, 1,800 lbs per 2-yard sack
- 54 cubic feet / 400 gallons / 1,600 quarts per sack
Freight and Ordering
One 2-yard sack fits per pallet.
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Less than 5 pallets (under 10 yards): Instant pricing online and the best value. Add to cart and check out.
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10 yards or more (5+ pallets): Email support@BuildASoil.com for a freight quote.
Looking for smaller, shippable sizes? See our bagged Worm Castings
What You Get
- Black, rich, moist, and well screened
- Always fresh, never last year's leftovers
- Ideal for compost tea and soil building
- Supports soil biology and plant health
- Backed by our 60-day satisfaction guarantee
How To Use
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Compost tea: 2.38% by volume, just under 2 cups of castings per 5 gallons of water. Read more.
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Soil building: 15 to 20% worm castings in your potting mix for vegetables or any heavy-feeding annual.
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Top dress: Apply liberally at any point in the plant's life. A 1 to 2 inch layer works well.
Testing and Quality Assurance
Consistency is the whole point of buying tested castings. Visit our Batch Testing Area and scroll to worm castings for the most recent results.
Wholesale and White Label
We keep this material available year round and work with orders of any size. If you produce your own soil, you can white label these castings or blend them into your own product. We're glad to work with other soil companies and commercial growers. Contact us to set it up.