How do heirloom Rattlesnake beans sometimes appear when intentionally left on the vine for superior flavor?

Bumpy and nearly bursting.

The Rattlesnake bean, a variety often associated with Appalachian cuisine, is sometimes deliberately left growing on the plant past the standard green harvest window. The goal of this extended maturity is not necessarily to dry the bean, but to reach a specific point of ripeness where the flavor profile becomes exceptionally complex and incomparable. At this peak maturity for flavor, the pods have developed significantly, appearing bumpy where the interior beans press against the wall, and they look as if they are nearly ready to burst open. Although this stage necessitates the labor-intensive process of stringing and snapping the tougher pods by hand, the resulting superior taste is considered justification for the extra preparation effort.