Vermiculite is a mineral formed by silicates of aluminum, iron and magnesium. Mixed with the substrate it favours the cultivation and propagation of seeds and cuttings. The professionals use it for all their sowings and you?
The vermiculite is used mixed with the substrate providing aeration and hydration. Retains nutrients and water avoiding asphyxiation of substrates. Vermiculite is usually incorporated into the substrate in an average proportion of 20%.
Vermiculite is an inert material with a neutral pH, it is light, porous and absorbs water fast. It is pathogens free.