Potting Soil Mixes - Knowledgebase Question

Name: Pat Decker
Cashmere, WA
Question by deckers
June 9, 1999
The recipes I have read for mixing your own potting soil, say you should add equal parts of ingredients. Is that by weight or by the cup?


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Answer from NGA
June 9, 1999

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It's usually by volume. Here's an easy recipe for your own soil-less potting mix. It creates one cubic yard of mix. Combine 1/2 cubic yard of sphagnum peatmoss and 1/2 cubic yard of vermiculite. Then add enough water to lightly moisten the material. Once it's all mixed up, add 5 pounds of dolomitic limestone, 1 pound of superphosphate and 2 pounds of 5-10-10 fertilizer. Mix thoroughly. If you'd rather create an organic mix, blend together 16 quarts of sphagnum peatmoss, 16 quarts of vermiculite, 7 ounces of bone meal, 3-4 ounces of dried blood meal and 3-4 ounces of ground lime stone. Mix together thoroughly.

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