Vermiculite is made from rock but has a high cation exchange capacity, which means that it will slowly release absorbed nutrients back into solution during the subsequent watering. Vermiculite is usually added to perlite at a rate from 5% to 50% to make a lightweight propagation medium that mixes good aeration properties with an ability to slowly release nutrients to the plants over a period of time.

ALL MEDIUMS WILL INCUR A £4.00 DELIVERY SURCHARGE