My grandmother always said, "those beans need some dirt". Over the years of gardening I've come to learn that grandma knows best. She explains things in layman's terms not technical terms, which I like. She doesn't always give you the reason for it but you know she knows what she's talking about. So if your growing green beans, put some dirt on those beans. Just take your hoe and pile up the dirt around the base of the plant. You'll be amazed how fast they will grow. Grandma knows best!