Amber Friedrichsen, Associate Editor, Hay and Forage Grower
(Previously published in Hay & Forage Grower: August 29, 2023)
The critical
fall period for alfalfa has been said to start about six weeks before the first killing frost, which is roughly around the first week of September for most of the Midwest. This hard stop in harvest schedules is supposed to ensure plants store enough energy in their roots to survive the winter, but with improved alfalfa varieties, variable stand conditions, and warmer weather patterns, how critical can this period really be?
Despite heat indices recently reaching the triple digits in some parts of the Central U.S., temperatures will likely calm down as we flip the calendar from August to September. The sun is also setting noticeably earlier each day, and the combination of milder temperatures and shorter day lengths sends a signal to alfalfa to prepare for fall dormancy.
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