Edward's difficulties were exacerbated by prolonged problems in English agriculture, part of a wider phenomenon in northern Europe known as the Great Famine. It began with torrential rains in late 1314, followed by a very cold winter and heavy rains the following spring that killed many sheep and cattle. The bad weather continued, almost unabated, into 1321, resulting in a string of bad harvests. Revenues from the exports of wool plummeted and the price of food rose, despite attempts by Edward's government to control prices. Edward called for hoarders to release food, and tried to encourage both internal trade and the importation of grain, but with little success. The requisitioning of provisions for the royal court during the famine years only added to tensions.