Kale is trendy because 1 cup of cooked kale delivers 19% of your daily vitamin A, which supports good vision, immunity, reproduction, heart, lung, and kidney function.
The mild flavor of spinach belies its nutritional value. Kennedy states "The most nutritious salad greens are generally the darkest in color."
"While most people throw the beet greens away or buy them with the greens removed, they're actually very nutritious".
The healthiest green you may not be eating is Swiss chard. Chard, a beet relative, tastes like spinach and is becoming more popular.
According to the USDA, one cup of mustard greens provides about half your daily vitamin C, all your vitamin K, and some folate.
Collard greens provide enough vitamin K. According to the USDA, they contain 14% of your DV of vitamin C and a little amount of vitamin E.
This salad green is popular in Europe but used as a garnish in the US. But don't underestimate watercress's nutritional potency.