See: Psophocarpus tetragonobolus. Winter cereal
As their name suggests, winter cereals are sown in the autumn, and are able to continue growing, quite slowly, throughout the winter. Spring cereals, on the other hand, cannot survive a winter and must be sown in the spring.
Winter cereals have the advantage that they can begin active growth in the spring as soon as the thaw sets in, probably several weeks before tractors can get onto wet land in order to sow spring cereals. This permits either (i) a longer growing season with a correspondingly higher yield, or (ii) an early harvest that escapes the full development of pests and disease epidemics.
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