Rye (Secale cereale) is a cool-season cereal grain known for its exceptional cold hardiness, ability to grow on poor, sandy, or acidic soils, and its role as both a grain crop and a winter cover crop. Rye is more winter-hardy than any other cereal grain, surviving temperatures as low as minus 30 degrees Fahrenheit (-34 degrees Celsius) under good snow cover. The grain is used for flour, whiskey and vodka distilling, and livestock feed.
Rye was domesticated in central or eastern Europe later than wheat and barley, likely appearing as a weed in wheat fields that spread north and west with cereal cultivation. The crop's superior cold tolerance allowed it to become a staple grain in northern and eastern Europe, where wheat could not survive the winter. Rye bread was the daily bread of much of Europe through the 19th century, particularly in Germany, Poland, Russia, and Scandinavia.
Rye was introduced to North America by European colonists and became a significant crop in the northern United States and Canada. Rye whiskey was an important colonial product, and Pennsylvania rye whiskey remained a major spirit category through Prohibition. Rye acreage declined in the 20th century as wheat production expanded into areas where rye was previously the only reliable grain, but the crop remains important as a cover crop.
Rye grows 3 to 5 feet (0.9 to 1.5 meters) tall with a slender head and long awns. The plant is more vigorous in early growth than wheat and establishes a root system that can extend 5 feet (1.5 meters) deep in the soil profile. The grain is longer and narrower than wheat, with a grayish-green or brownish color. The protein content of rye grain is 10 to 14 percent.
Rye has a higher tolerance for drought, low fertility, and acidic soil than any other cereal grain. Winter rye is planted in autumn and resumes growth in early spring, often growing earlier than any other crop. The grain matures earlier than spring-planted crops. Rye also produces more biomass per acre than other cereal grains when grown as a cover crop.
On a homestead, rye is grown for home flour production (rye flour for bread), as a winter cover crop, and for livestock forage. The grain can be used in home distilling for rye whiskey or vodka. Rye flour contains less gluten than wheat flour and produces a dense, dark bread.
As a cover crop, rye is unmatched for weed suppression, erosion control, and scavenging of residual soil nitrogen. The deep root system improves soil structure and drainage. Rye can be planted later in the fall than any other cover crop and still establish before winter. The crop must be terminated before it sets seed in spring, as it can become weedy in subsequent crops.