Types of Lime for Garden Use

Quicklime (calcium oxide): White crystalline solid; highly reactive with water (generates heat). Sold at masonry suppliers. CAUTION: Highly caustic.
Hydrated lime (calcium hydroxide): Dry powder from quicklime + water. Sold at garden centers. CAUTION: Caustic.
Garden lime (calcium carbonate): Ground marble dust; bagged or pelletized for spreaders.
Dolomitic lime: Garden lime with magnesium carbonate. Most lime sold in Georgia is dolomitic.

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