Everydayhealth.com suggests a healthy idea is to get more variety into the salad bowl

Brigid K. McVaugh, MS, RD, LD, a clinical dietitian at St. Luke's Episcopal Hospital in Houston, said all greens have something to offer, "where they differ is in the vitamin and mineral content."

Read on to find out the benefits of:

Romaine lettuce is another good source of folic acid. Its dark green color, long leaves, and crunchy texture make it a very popular salad green. Romaine is rich in vitamins A and K, but it isn't quite a mineral powerhouse. Mix it with some spinach or kale to make your diet higher in nutrition.