Overview

Canola is a cultivar of rapeseed (Brassica napus L. and Brassica rapa L.) bred specifically to produce edible oil low in erucic acid and glucosinolates. The oil is neutral in flavor with a high smoke point, making it one of the most widely used cooking oils in North America. The plant itself is a yellow-flowered annual grown primarily in Canada, the United States, and Australia.

Origin and history

Canola was developed in Canada during the early 1970s through conventional plant breeding by Keith Downey at Agriculture Canada’s Saskatoon Research Station and Baldur R. Stefansson at the University of Manitoba [1]. The goal was to create a rapeseed variety with less than 2% erucic acid (a fatty acid linked to heart issues in animal studies) and less than 30 micromoles of glucosinolates per gram of meal (compounds that made traditional rapeseed meal unpalatable for livestock) [2]. The name “canola” is a portmanteau of “Canadian oil, low acid.” Commercial production began in 1974, and by the 1980s canola had largely replaced traditional rapeseed in Canadian and American agriculture [3]. The crop is now a major global oilseed, though it remains distinct from older rapeseed varieties still grown for industrial uses.

Varieties and aliases

  • Canola (generic term for low-erucic-acid, low-glucosinolate rapeseed)
  • Rapeseed (the parent species; not interchangeable with canola in culinary contexts)
  • Brassica napus (Argentine canola, the most common species)
  • Brassica rapa (Polish canola, less common)
  • LEAR (Low Erucic Acid Rapeseed, an older term)
  • Double-low rapeseed (referring to low erucic acid and low glucosinolates)

Culinary uses

Canola oil is used for frying, sautéing, baking, and salad dressings due to its neutral flavor and smoke point of approximately 400°F (204°C). It is a common base oil for margarine, mayonnaise, and commercial shortenings. The seeds themselves are not consumed directly; the meal left after oil extraction is used as high-protein animal feed. In Japanese tempura, canola oil is frequently blended with sesame oil as a neutral frying medium. In Mexican home cooking, canola oil is often used as a substitute for lard or vegetable shortening in frying and baking, though it lacks the flavor of traditional fats.

Cross-cuisine context

Canola has no direct analogue in traditional Mexican cuisine, where frying fats were historically lard (manteca de cerdo) or, in coastal regions, coconut oil; avocado oil is a modern alternative. In Korean cooking, perilla oil and sesame oil serve flavor-specific roles that canola cannot replicate. In Japanese tempura, canola oil is used as a neutral base in commercial blends, but traditional tempura oil is a blend of sesame oil and cottonseed or rice-bran oil. Comparison-by-function: canola is closest to other neutral high-smoke-point oils such as refined sunflower, safflower, or grapeseed oil, which are used similarly across cuisines.

Notes for cooks

  • Canola oil is not a substitute for extra-virgin olive oil, sesame oil, or other flavorful finishing oils. Use it where neutrality is desired.
  • Store in a cool, dark place. Canola oil has a moderate shelf life of about one year unopened; rancidity is signaled by a fishy or paint-like odor.
  • For deep frying, canola oil performs well but degrades faster than palm or coconut oil at sustained high heat. Change oil after 8 to 10 uses.