An excellent alternative for germinating seeds and root development. The Flexiplugs and Flexitrays are comprised of 90% organic materials in the form of composted bark and peat, held together by a non phototoxic binder that produces a sponge-like plug cell or cube. The plugs have about 50% fixed capillary pores that retain water while the other half of the pores do not. This high porosity is the key to a healthy root system and will not compact, providing good aeration throughout the growth cycle. Designed for most types of plant propagation from seeds or cuttings. Ideal for starting seeds indoors.