Worm Compost Leachate, Good or Bad?

Image: Permaculturewiki.

Image: PermaWiki.

In the course of preparing for our worm composting demo last week Kelly and I came across a lot of conflicting information. One of the most contentious issues in worm composting is what to do with the liquid that comes off the worm bin, called leachate.

The controversy stems, in large part, from the debate over aerated compost tea (ACT) vs. non-aerated compost tea. Fans of ACT do not like the fact that worm bin leachate is anaerobic, which they believe encourages the growth of microorganisms unfavorable to plants. They like to point out that worm bin leachate is not ACT.

The ACT debate needs a much longer post, but I did find two peer reviewed studies showing the benefits of un-aerated worm compost leachate: “Vermicomposting Leachate (Worm Tea) as Liquid Fertilizer for Maize and “Vermicompost Leachate Alleviates Deficiency of Phosphorus and Potassium in Tomato Seedlings.” I also found several Extension Service publications touting the use of worm bin leachate.

There are some caveats, however. First, it needs to be diluted–at least 1:1 and maybe, according to some sources, as much as 1:10. And you should probably test it out on a few plants before applying it to your whole garden.

And, from a food safety perspective, I’d avoid applying it to leafy greens and lettuces. I’d also point out that if you have a lot of leachate it might mean that your worm bin has too much moisture in it.

What do you think? Have you used worm bin leachate successfully? What side of the aerated vs. non-aerated debate are you on?

Saturday Linkages: Pallets, Ladybugs and Portlandia

Brothers-in-Benches-by-r1-2-537x403

Street Artist Recycles Reclaimed Wood Pallets Into Mobile Pop-Up Benches in

Console Table with 3 legs – Outstanding – IKEA Hackers

Jailed for collecting rainwater:  [Update: A reader notes that there is more to this story than the headline indicates–looks like the person jailed may have been damming streams and taking water from his neighbors.]

Little chicks wearing muffin wrappers as tutus!

The Flight of the Ladybugs

The Portlandia Activity Book

World made by bigots

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Worm Composting Demo at Summer Nights in the Garden

SummerNights

Join Root Simple for a worm composting demo at the Natural History Museum’s Summer Nights in the Garden series this Friday August 28. We’re showing how to set up your own vermicomposting system and raffling off a worm bin. Plus it’s the debut of the new WormCam! Grab a cocktail and join us and KCRW DJ, Anthony Valadez. The garden is one of the best in California and the event is freeeeeeeeee. More info here.