This is a great mix for starting seeds or growing seedling sized plants. The base of this mix is New Zealand Long Fiber Sphagnam that has been milled into a fine consistancy (petal grade). There is also a finer grade Orchiata and perlite to help keep the mixture light and airy. The milled sphagnam is best for seed starting as the small plants can more easily push through to the surface of the soil. They do not get stuck down in the substrate or tangled up in the longer fibers.