Do any of you worm farmers have a shredder that you use for newspaper/cardboard? We have lots of cardboard that I would love to use in my composting, but breaking it down into pieces that will decompose relatively quickly is a chore. In the fall I just flatten out boxes and lay them on top of all my garden beds and cover with shredded leaves. But the rest of the time I would love to find a shredder that can make fast work of cardboard.
I haven't started a worm farm yet, but we bought these last year:
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Instead of using all soil (which is expensive if you have to buy it) we filled the bottom 2/3 with cardboard, grass clippings, leaves, garden waste, kitchen waste, etc., in layers. Then we added about 10 or 12 inches of good garden soil in the top. By the end of the first year, the depth had gone down enough that I could layer more cardboard and shredded leaves on the top. All winter long I dumped the pulp from our green juicing on top of the garden beds. By this spring these two beds were TEEMING with red wigglers. Never added any worms - they just found us! The center portion is designed to hold compostable material during the growing season - I dump my coffee grounds and other kitchen compostables in there, but I have to be careful because my raccoon friend found out my secret. So I lay some cardboard or newspaper over the top. That seems to keep her interest at bay! The composting material in the center also feeds the beds all during the growing season with nutrients and encourages the worms to travel through the bed.
I love these beds because our yard is small (OK - my yard is mostly pond! haha!) so I don't have as much room to compost as I would like. "Composting in place" has been a great solution for us!