Coleman uses a soil block maker that he developed for Johnnyâ€™s Selected Seeds ($22 to $170 depending on the size). This is a mold that forms the wet growing medium into cubes. You can use different sizes to contain seeds of varying sizes.
Make a blocking mix that will hold together but not harden out of peat, sand, soil, and compost. Coleman uses the following recipe to make a large amount of mix at one time.
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