Rye
Rye (Secale cereale) cross-pollinates readily, which is why on our small-scale production level, we are only able to grow one variety at a time.
However: "Rye is very cold tolerant, the hardiest and most disease resistant of the winter cereals. Fall rye has an extensive fibrous root system, can scavenge nitrogen very effectively, and utilizes early spring moisture to grow rapidly. Fall rye is faster growing and earlier maturing in the spring than the other winter cereals, including wheat, barley and triticale. This enables an earlier forage harvest and more "double crop" options."[1]
Although rye flour does not develop true gluten, it has proteins which give it the capacity for making a nutritious leavened bread. Rye is usually mixed with 25 to 50% wheat flour for bread making."
Note, a bushel of rye is 56 lbs!
Our favorite Rye Bread Recipe
[1] Source: Double Cropping Fall Rye for Extra Forage