Also called string beans, green beans are made up of small seeds encased in long pods. Because they are harvested while still young, the pods are tender and edible. 

In Season: Green beans are available year-round with a peak season of May to October.

What to Look For: It's best to buy green beans that are sold loose rather than in packages so you can pick the freshest ones. They should be crisp and bright green, without blemishes or signs of wilting. For even cooking, choose beans that are of similar size.

How to Store: Although they taste best if used right away, green beans can be refrigerated in a sealed plastic bag for up to five days.