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We covered the garden of layered materials with a black tarp, weighing the tarp down with bags of leftover leaves and some old cinder blocks. The idea is to let the lasagna garden "bake" for a few weeks or months, but this step isn't necessary. You can plant in the garden as soon as you build it. The garden site does have the appearance of a grave, doesn't it?
Just two months later, in late May, I planted several vegetable seeds and seedlings in the garden.