Look for Green Stems: Recently picked green beans will have green stems. If the beans have been harvested for a while, those stems will gradually turn brown. Try to select green beans with green stems (if they’re still intact).
Avoid Green Beans with Brown Spots: Fresh green beans should have a uniform green color. If the beans have been harvested for a long time, brown spots will start to emerge on the green bean.
Avoid Green Beans with Large Bulging Seeds: If you find green beans with large bulging seeds, it means the seeds have pulled nutrients away from the rest of the bean. As a result, the seeds are tougher and the rest of the bean isn’t as fleshy. This is also a matter of preference. If you don’t mind eating green beans with tougher seeds, feel free to buy them!
Fresh Green Beans Should be Pliable: My mom likes to give the green beans a gentle squeeze to see if they bend. If they bend relatively easily, it means the flesh is still tender. If the green beans are very stiff, she’ll avoid those beans. Squeezing every single bean is a tedious process, and my mom doesn’t do that to all the beans she buys.