All that ryegrass- the choice seed for overseeding in drought-prone or desert areas- comes, not so surprisingly, from the northwest United States. Oregon, actually, is one of the biggest shippers. Just like any other crop prices all depend on availability, and a good growing season with lots of acres planted means cheap grass. However, in recent years many producers have moved away from the much-desired ryegrass to more lucrative crops. With that in mind, while ryegrass is the perennial favorite, other cool-weather grasses are available, such as bluegrass, which serve the same purpose.