The thin sheets of Grodan stone wool are specially developed for quick growing crops that need minimal substrate. Using the Grodan Cress Plate will result in uniform and quick crop development. The Grodan Cress Plate has been designed to fit perfectly inside a standard-sized propagator dome. Stone wool is the ideal substrate for professional microgreen production because the fine fibrous structure is perfect for young, tender roots to explore. Even the comparatively short growing cycles associated with microgreen cultivation can be reduced thanks to the unique way in which stone wool encourages the formation of fine root hairs as well as its ability to store and release moisture and nutrients.