Storing worm castings

What is the best way to store worm castings and how long will they be good for?

Comments for Storing worm castings

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Apr 15, 2012
Follow-up to dry castings comment
by: Sierra Worm Compost

The slime that holds the casting together makes them as hard as concrete and very difficult to re-hydrate. You would revive some microbes, but the vast majority of them are dead. Use it on your own garden, lawn or field for testing purposes and note any positive/negative results.

Apr 15, 2012
Dry Castings
by: Anonymous

Great to know. If they are dry can you moisten to revive or have you lost the product? I was given about 50-5 gallon buckets and want to know what to do.

Apr 14, 2012
Storing worm castings
by: Sierra Worm Compost

The cardinal rule in castings is that you don't want them to dry out. Keeping them at about 20% moisture ensures microbial life. Microbes die if it dries out completely.

Depending on how much you have, zip lock bags (with a few air holes punched around the top) are good containers kept in a cool, dark place. If you have a lot castings, clean plastic garbage cans are good also.

The 20% moisture is attained when you take a handful, squeeze it and the mass should just hold together. Any wetter and you'll need to dry it out a bit. If it's drier, simply spritz with a spray bottle or fine-mist from a hose and mix until the squeeze test succeeds. To take the guesswork out, I would suggest investing in a moisture meter.

I wouldn't store longer than 6 months, certainly no longer than a year and always keeping tabs on the moisture content.


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