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Yes, elemental sulfur, sometimes called "flowers of sulfur", is an acceptable organic soil amendment under the U.S. National Organic Program (NOP) guidelines. It's used to reduce soil pH, which makes phosphorous, iron, zinc, and other minerals more available to plants.

Sulfur works by increasing populations of Thiobacillus bacteria in the soil. The bacteria multiply to break down the sulfur and release dilute sulfuric acid into the soil, lowering its pH. Because it requires bacteria to break it down, the sulfur needs to be mixed into the soil, so it's in contact with the bacteria. If it's not mixed in, you'll have strongly acidic areas around blobs of sulfur near the surface, and no effect elsewhere in the soil

Sulfur only works in warm (summer) soil temperatures, and it takes 1-3 months to have an effect, so it's not a quick-fix.

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