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Oh yeah, I forgot. So if we did cover crop the plot, I am still confused about what the "digging under" looks like when the crop has run its course and it's time to plant. Do I have to go in there with a tiller? Just mow it down? Use a spade? Will it turn into a weedy mess?
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I don't know how nitrogen crops set seed, but with any plant you get rid of the seed before turning it over. So if it is a grassy thing I guess you would mow it, rake the stalks and remove them for mulch. Then use a shovel to turn over the soil. If there is root materials there, depending on how big it is, remove it or leave it to break down.
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I've had good luck putting soil on top of a lasagna garden made in the spring and planting into the soil. As it composts down, it does generate some heat which helps the plants. You may need a bit of nitrogen to compensate for the composting process. One year I had tomatoes in a bed like that when an unpredicted frost hit. They were the only tomatoes in the whole garden to survive.
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Well, good news! Just back from the garden where the compost coordinator showed me our plot. They already chucked a goodly amount of leaves on it, and I will continue to add coffee grounds. It is a muddy mess right now but as I bring more grounds over, I might try to add a layer of leaves from the community pile every time. Little by little we'll build it up.