RC Big Rock Switchgrass

New and improved over Cave-in-Rock!
  • RC Big Rock is a new late season variety of upland switchgrass developed from Cave-in-Rock.
  • Very tall height and high yield potential – likely to reach 7′ tall along the I-35 states, and up to a foot taller moving east to Wisconsin and beyond.  It is the tallest upland switchgrass released to date.
  • Genetically improved for ease of establishment, upright growth habit and increased height, making it an ideal choice for high quality habitat for deer.
  • Provides a better wintering habitat for pheasants and quail than Cave-in-Rock; better standing than all other commercial upland cultivars of switchgrass.
  • Late-season maturity approximately 9 days later maturity than Cave-in-rock.
  • Large seeded variety selected for reduced seed dormancy, increased seed weight and increased seedling vigor.
  • Excellent winter hardiness for a late season variety, especially if grown for habitat.
  • Like Cave-in-Rock it grows well on diverse soil types and has a wide regional adaptation to states in the mid-west and northeast regions (Wisconsin, Iowa, Illinois, Indiana, Michigan, Ohio, New York and Pennsylvania). Due its later maturity, it is also well suited for use in Kentucky, Missouri, Nebraska, Virginia and West Virginia.
  • A multi-purpose grass variety suited for forage, biomass, soil conservation and wildlife habitat applications.

Pure Stand Seeding Rate PLS lbs / acre: 6.0

Height: up to 7’+

Ships December 2022

$16.00 / Pure Live Seed Pound

Available on backorder


Our native grass and wildflower species come from Midwest growers and are adapted to the Upper Midwest. We meet all state and federal seed laws, and we do not sell seed contaminated with palmer amaranth. Native grasses and forbs are priced by Pure Live Seed (PLS) per lb. Visit www.alseed.com for full descriptions of our native species and mixtures.