Rye rye (secale cereale) is a grass grown extensively as a grain, a cover crop and a forage crop. It is grown principally in an area from eastern and northern europe into russia. Types of rye rye comes in many of the same forms as other grains, but with a twist รขโ‚ฌ there are many kinds of rye รฏยฌโ€šour, and their names can be confusing.