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POPSWarmer winters threaten agriculture, says UC Davis More: California's prune crop is already facing serious problems as each winter's chill time grows briefer, Luedeling said in an interview. "And walnuts are going to have a hard time," he said, because their blooming period is becoming less regular. "The take-home message," Zhang said in an interview, "is that farmers and consumers need to be prepared for major cultural changes in the tree crops California farmers are growing."