Bulk Worm Castings




Premium Bulk Worm Castings

Worm castings provide your plants with readily available nutrients, microbes and beneficial bacteria. Additionally, they improve soil structure by giving roots the space to grow fast and fibrous, which promotes rapid plant growth. Castings also allow for excellent drainage in soil so roots don’t become waterlogged or develop root rot. As well as improving aeration, earthworm castings also increase soil’s water retention capacity, as they contain absorbent organic matter that holds only the necessary amounts of water needed by the roots.

We carry premium, pure, pest-free castings.

worm castings water test at walts organic

Worm Casting Water Test

Often, worm castings are sold with undigested materials still in the mix. You can test for this by scooping some castings into a jar, filling it with water, shaking and letting everything settle. The good stuff, pure worm poo, will sink the the bottom, while undigested materials float to the top. As you can see above we conducted our own little test with great results.


If you are looking to order larger quantities, come visit us at our store in Magnolia (Seattle) or contact us at orders@waltsorganic.com

*We do our best to provide you with useful, accurate information. That being said, we can make no guarantees. Much of what we have posted we believe to be common knowledge in the agricultural and horticultural worlds. In addition, we want to give credit where credit is due. Our resources page lists resources we commonly use and encourage you to use too.

Additional information

Weight 3 lbs

4 lbs, 25 lbs


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