Jonathan Green Contractor's MixIdeal for soil stabilization Use for temporary lawn seeding Contains annual ryegrass which germinates in 7 10 days Grows in full sun to medium shaded lawn areas Jonathan Green Contractors Grass Seed Mixture is the ideal grass seed for soil stabilization or temporary lawn seeding. Contractors Mix contains annual ryegrass so it germinates quickly and provides a fast grass cover. It is most often used by new home builders to establish a lawn quickly