Richard

I buy my worm castings from Julie Harski in Ramona, CA. She created several long trenches (with a backhoe?) on her property to cultivate the red wriggler worms. She feeds them with buckloads of produce scrap from the 4 farmers markets she attends, plus horse manure from her horse. The scraps are just dumped on the surface and then covered with a tarp. To harvest, she has a sifter with 1/8th inch screen mesh. It is columnar in shape, but mounted sideways with an axle running through it. I would guess the capacity is 1.5 cubic yards.

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