Perlite is an inert material created
by heating volcanic glass at high temperatures. Perlite improves drainage
and aeration of soils.
Vermiculite
Vermiculite is a sterile mica compound
that has been heated to create expansion. Vermiculite increases air
porosity and water retention.
Peat Moss
Horticultural Grade Sphagnum Peat Moss
provides porosity and enhances water holding capacity. Peat moss lightens
the soil, thus reducing resistance to root penetration and growth.