Seed in a Blanket Flower Roll Butterfly Garden Mix Mats are constructed using seed, an inert distribution media, and a water retaining polymer sandwiched between two layers of highly processed wood fibers and held together by a food grade resin. Minimum Number of seeds: 1250 Germinates in 1 to 4 weeks 10" x 10' Seed in a Blanket flowering roll Cut! Place! Water!