Arugula's Flavor Depends on the Variety
Another factor that influences the flavor of arugula is the variety of the herb that is grown and consumed. Arugula, like lettuce and kale, is a leafy green that comes in a variety of forms and sizes. Each one can produce a distinct flavor. According to the Guardian, the flavor of arugula is most strongly divided between two cultivars: the broad-leafed eruca sativa and the spear-shaped selvatica.
Cornell University's gardening sites include upwards of 20 varieties of cultivated and wild arugula (meaning there are 20+ types to eat). Some varieties, such as "rucola selvatica", have a nutty flavor. Other varieties, like "even star arugula", have an especially sharp taste. So, if one variety doesn't appeal to you, you might want to try another. Wait until you learn about what this plant can do for your body if you enjoy its intriguing flavor.