Retention Basin Mix (Mix 132), 1250 Certified Pure Live Seed, True Native Seed (Northeastern US) FREE SHIPPING Number of seed is Pure Live Seed, not bulk Species is US Native, not introduced alien We grow the seed so we control quality A Retention Basin Mix containing 12 species of native grasses and sedges and 14 species of native wildflowers. Flowering period and flower colors are coordinated for full season variety. The number of seeds in a pound of each species is used to calculate the amount of seed of each species that is needed in this mix.