Need ideas on how to keep your salad greens fresh? A nutrition specialist with Nebraska Extension shares these salad-making tips. Salad dressing slides off damp salad greens and collects in the bottom of the salad bowl. You’ll get more flavor with less dressing (and fewer calories!) if salad greens are washed and dried before tossing your salad with dressing. A tablespoon of an oil and vinegar dressing may be all it takes for two cups of dried salad greens.