As with later stages of growing, supplements can speed up seedling and cutting development. Rooting hormones will speed up the roots on a clone. The first feeds will speed up the seedling/sapling process to get out of the propagator and into your pot quicker. sprays help the plants to stay healthy by giving them the elements they cannot get when they have no roots. Substrates are a media to put your seeds and cuttings into. Propagators are a mini greenhouse for your babies. remember, never let it go below 20c or above 24c if you want success in propagation.