Hordeum vulgare. An open pollinated hardy annual. Barley Cover Crop Seeds are a fast-growing grass with fibrous roots that can reach as far as 2m (6′) deep. It is less upright than oats, and not nearly as weedy as rye. Excellent for erosion control and holding nitrogen, which will be released as the the tilled barley decomposes. Barley is great for grain and straw production. Underseed with Crimson Clover, harvest the grain, and then till under the clover in the first or second year. Barley does not overwinter in cold climates – will winter-kill at -8°C (17°F). 50kg per acre. 500g covers approximately 438ft.