Most canola crops are grown without requiring irrigation in the Prairies, the nation's agricultural heartland spanning nearly 1.8 million square kilometers (695,000 square miles). But the region is sensitive to droughts, whose frequency and severity have been steadily increasing. In this region, explains Phillip Harder, a hydrology researcher at the University of Saskatchewan, in Saskatoon, "crop production relies on water that accumulates throughout the year." In other words, snow that accumulates over winter and soaks into the ground during the spring thaw. But howling winds over fields that stretch as far as the eye can see have been blowing away much of that snow of late.