Widely used by professional horticulturists perlite is a naturally occurring material ideal for use when rooting cuttings and potting on to stimulate healthy root growth and improve aeration and drainage add to the compost and it will help to retain air and make waterlogging almost impossible the balance of air and water minimising damage to roots when transplanting it accelerates rooting and reduces the risk of fungal diseasesperlite is a non toxic volcanic rock that has been heated t