Cosaque Black Oats

The “Cosaque” Black Oat is a black seeded winter oat.

Many growers plant Cosaque in late August. Excellent fall growth, continuing through the cold of winter in Mid-Atlantic and Northeastern states, and matures later in the spring than other oat varieties.

Cosaque oats mixes well with other winter annuals, such as crimson clover, hairy vetch, or annual ryegrass.

Reasons for choosing Cosaque:

  1. Higher biomass compared to cereal rye, ryegrass, wheat, triticale and other oats.
  2. Good cold tolerance.
  3. Good disease resistance.
  4. Excellent winter weed suppression.
  5. Nematode suppression.
  6. Good residue for next crop if grown as a cover crop.
  7. Higher yields in the following crop.
  8. Excellent nutrient-rich forage for grazing, hay, baleage and silage.
  9. Great weed suppression.
  10. Excellent selection for a forecrop.

Cosaque Oats Tech Sheet

At A Glance

  • Overwintering Oat
  • High biomass oat, good tillering
  • Good cold tolerance and disease resistance
  • Wide leaves and leafiness provide excellent winter weed suppression
  • Nematode suppression

Key Characteristics

  • High yielding oat with high test weight. Our latest maturing oat.


  • Cover Crop: Excellent Haylage/Balage: Excellent
  • Management Intensive Grazing: Good
  • Continuous Grazing: Fair during fall and spring.
  • Dry Hay: Poor


  • Seeding Dates: Late summer through barley planting dates (Early-Mid Fall)
  • Seeding Rate: 80-100lbs/Acre for forage and 30-50 lbs/Acre for cover crop use. Increase seeding rates for late plantings.
  • Large Seed Box Required
  • Seeding Depth: 1” to 1 1/2”
  • Speed: Establishes quickly