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Montana Sulphur
The Montana Sulphur Company — located in Billings, Montana — manufactures Yellowstone Brand Sulfur for use in organic agriculture. Use it to lower pH in alkaline soils or around acid loving plants like azaleas, rhododendrons and blueberries.
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Elemental Sulfur
Lowers pH in alkaline soils and is used around acid loving plants such as azaleas.