Bean (Climbing French) Seeds - Cobra RHS Award of Garden Merit Winner! The Climbing French Bean - Cobra is a huge improvement on the Blue Lake Bean variety, with vigorous plants that yield up to a third more beans! The Climbing French Bean - Cobra produces beautiful round, stringless pods that can grow up to 20cm in length. They can grow through summer all the way to autumn if the beans are picked regularly. These delicious tasting Climbing French Beans will be a family favourite on their dinner plates in no time! A perfect winner of the RHS Award of Garden Merit.