Potting Soil Mixes - Knowledgebase Question

Name: Pat Decker
Cashmere, WA
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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?

Answer from NGA
June 9, 1999
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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