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Hi
Had this problem with Cobra this and last year as well,also the bean pods were different shapes on the plants, maybe the seed is too blame.
Then again two varieties of dwarf green ones were not of the best taste though the dwarf yellow ones tasted as normal.
Though did not harvest a lot of yellow ones, the slugs and snails desimated the plants!
![Sad :(](https://chat.allotment-garden.org/Smileys/green/sad.gif)