Gro-Sure vermiculite encourages germination and strong and healthy seedling growth. Gro-Sure vermiculite is a naturally occurring mineral that has been heated to high temperatures to produce lightweight, absorbent flakes, perfect for a range of gardening tasks. It provides insulation for healthy seed germination, helps retain moisture and nutrients. The drainage and aeration properties encourage healthy seedling growth and establishment. It can be added to seed and cutting compost for additional benefits.