Lime Posted on November 8, 2022August 1, 2023 by Tex Norwood Tags: Growing Media, SoilA rock powder consisting primarily of calcium carbonate. Used to raise soil pH (decrease acidity). Related Images:Related Articles: Fertilizer BasicsGuide to Coco Coir Growing MediaSoil pH and its ImportanceAbout Frost and Freeze DamageGlossary: Calcium CarbonateVisit our InfoTIP Glossary