A cherry tree and its blossoms are covered with snow in an orchard near Traverse City, Mich. Three years ago, almost every fruit crop in Michigan was frozen out when cold temperatures followed some 80 degree days in March. John L. Russell/AP hide caption

toggle caption John L. Russell/AP

At Michigan State University's Clarksville Research Station, researchers apply pollen by hand to tart cherry blossoms, in order to breed new varieties. Dan Charles/NPR hide caption

toggle caption Dan Charles/NPR