Mustard greens are regarded as a cool season crop. They are rich in folate and vitamins A and C. When selecting your greens, choose unblemished ones, with now yellowing or brown spots.
Spinach comes in early spring in warmer climates. It is naturally fat free and is a source of iron. When purchasing, a sign of freshness are bright green bunches.
Artichoke leaves in your grocer's produce section should be tightly closed. You can also check for bruises within the creases of the leaves. Keep your artichokes refrigerated.