Gro-Sure Vermiculite (Pouch) 20200005 Naturally occuring lightweight material Helps retain moisture & nutrients Provides insulation for healthy seed germination Size 10L Gro-Sure Vermiculite is a naturally occuring mineral which has been heated to high temperatures to produce lightweight, absorbant flakes, perfect for a range of gardening tasks. Why use Gro-Sure Vermiculite? Gro-Sure Vermiculite encourages strong, healthy seedling growth and establishment. The fine grade flakes can be used on their own or added to Gro-Sure Seed & Cutting Compost to: � Help compost hold onto vital plant nutrients � Increase compost water retaining capacity � Insulate seeds against damaging temperatures and humidity changes (when used as a seed covering)