Ideal for propagation and water retention. Another firm favourite with keen gardeners is vermiculite. When you want to retain water, then add vermiculite to your chosen media. PLANT!T Vermiculite is a natural, sterile soft mica mineral with great water holding and insulation properties. It also offers a high cation exchange capacity, which means that it will slowly release nutrients back to your plan that it has absorbed during watering. Using PLANT!T Vermiculite can also aid propagation when used as a top layer, as it reduces evaporation. Using PLANT!T Vermiculite also reduces plant stress in extreme weather conditions due to its insulation properties. PLANT!T Vermiculite is easy and safe to handle, odourless, lightweight and simple to use