The full soil block recipe is included below. If you are just getting started with soil blocking, I suggest following this recipe exactly for the best results. Then you will know how a good mix should behave before you start experimenting with any alternative ingredients.

We make three variations of the mix for different sized blocks, this is the recipe for the mix we use the most often.

30 cups peat moss
25 cups compost
20 cups perlite
3/4 cup organic fertilizer blend
1/2 cup rock dust (optional)
1/8 cup lime
30-40 cups of water

Compost is mostly responsible for adding the microorganisms and the fine humus particles that are needed to glue the soil blocks together. Peat moss contributes most of the organic matter to help hold moisture, and its longer strands lock around each other and work with the compost to hold the blocks together. Perlite is very porous and is valuable for its ability to maintain tiny pockets of air within the soil blocks. Fertilizer provides the nutrients that may otherwise be missing from the primary ingredients. We make our own custom blend of slow release organic fertilizers, but a well balanced organic fertilizer would work here too. Rock dust is used as insurance that a wide spectrum of trace minerals are available. Lime is used to balance the acidity of the peat moss.

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