Use vermiculite rooting

Vermiculite can hold a good growing conditions of humidity because of its strong water retention and permeability. It can induce germination of the seed or rooting of the plant. So leaf insert or seeding will usually dope a certain percentage of vermiculite. There also some plants are using pure vermiculite to root. Rooting of rose, geranium and other cuttings can also use pure vermiculite.