Vermiculite

Vermiculite – Water Retention & Nutrient Reservoir

Mineral Amendment for Moisture Buffering and Insulation

Vermiculite is a natural, flaky mineral that expands when heated, creating a material with an exceptionally high capacity to hold water and nutrients. Unlike Perlite, Vermiculite’s primary function is to retain moisture, acting as a small reservoir within the growing medium. It also provides a degree of insulation, protecting tender roots from temperature fluctuations.

Key Benefits

• Dramatically increases water retention, reducing watering frequency.
• Holds and releases essential nutrients due to its high Cation Exchange Capacity (CEC).
• Insulates the root zone against temperature swings, beneficial for seedlings.
• Soft, lightweight structure is ideal for use in seed-starting mixes.

Composition & Specs

• Material: Hydrated magnesium-aluminum-silicate mineral.
• Function: Moisture retention and nutrient exchange.
• Typical pH: Neutral to slightly alkaline.

Usage Tips

• Mix into peat-based potting soils for improved moisture retention.
• Use as a top layer cover on seed trays to retain surface moisture and heat.
• Combine with Perlite and Peat Moss for the ultimate seed-starting blend.

Vermiculite is crucial for custom blends where consistent moisture and nutrient stability are required.