Gypsum

Gypsum Powder

Gypsum Powder is a fast-acting, highly soluble source of calcium and sulphur—two essential secondary nutrients that play a key role in plant development, root health, and soil conditioning. Mined and milled in the UK, this ultra-fine grade dissolves readily in water or soil, making it ideal for quick nutrient delivery without altering soil pH.

What Gypsum Powder Does for Your Garden

• Adds Calcium and Sulphur: Supplies calcium to strengthen cell walls and sulfur to support chlorophyll production and enzymatic activity.
• Improves Soil Structure: Helps break up compacted clay soils and promotes better root penetration.
• Enhances Water Infiltration: Improves water movement and drainage in dense or heavy soils.

Additional Benefits of Gypsum Powder

• Safe for indoor and outdoor gardening.
• Does not raise or lower soil pH.
• 100% natural, with no synthetic additives.
• Supports long-term soil fertility and nutrient availability.

Application Rates

• Potting Soil Mix: Apply 2–6g per litre of soil.
• Top Dressing: Use 0.5–2g per litre of amendable soil volume.

For best results, amendments should be applied after a soil test. Contact us if you need advice.

Nutrient Content 

• Calcium (Ca): 22%
• Sulphur (S): 18%
  
• Sodium (Na): <0.5%

Product Data

• Mean particle size - 30μm
• Solubility - 2.1g per litre
• Hardness (MOH Scale) - 2