Biodiesel from Washington-grown canola seed may be all the rage for people interested in a renewable, domestic form of energy. But a new law gives some farmers in one of the state’s oldest industries the power to keep canola away from their crops. ”All we wanted was a canola-free zone,” said Kirby Johnson, a Skagit Valley seed farmer. After a year of meeting with state bureaucrats and watching local and state leaders tout the benefits of fuel made from Washington-grown crops, seed farmers such as Kirby can now petition the Washington State Department of Agriculture to establish restrictive zones for canola production.