Growers who plan to rotate between canola systems for improved weed control or to try a different variety as part of a blackleg management plan may want to book seed soon. That way they can be sure to get a variety that fits the plan. Although growing conditions in 2011 will strongly influence which weeds will dominate, growers usually know if they have problem weeds — such as cleavers — in certain fields. They may want to choose a system that provides good control of those weeds in order to maximize their yield and minimize the risk of weeds developing herbicide resistance.