Every pellet of perlite is filled with tiny holes which store air, food and moisture for the hungry thirsty roots of your young plant. An ideal medium for planting seeds, cuttings and every growing thing. Place 1 inch of perlite in the bottom of planters to provide good drainage. Perlite can be mixed earth, peat, charcoal and other media to assist your plant in its growth. The finest material known for aeration, drainage and storing of moisture and plant food.