They occur in years when canola is subjected to severe heat and drought stress, particularly when that stress occurs during seed development. Some varieties appear more susceptible to forming high levels of free fatty acids than others. Growing a recommended varieties does not guarantee low levels of free fatty acids, because it is not possible to predict stress. However, growing a recommended variety will reduce the possibility of high FFA and minimize the risk that crushers will refuse to accept or severely discount loads of canola because of FFA's. It is not as tolerant to drought as cereals and does not perform well on wet soils.
Groundhogs can be a major problem as they feed on canola.
Spring canola should be seeded as early as possible. Research in Ontario has shown that date of seeding has a greater influence on yield than any other factor. Later plantings reduce yields. Winter canola should be planted August 15-30 to get adequate root development for overwintering and to withstand desiccation. Areas along Lake Huron or downwind from large bodies of water are most suitable for winter canola.