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Runners are much more of a problem as they do not come true being outbreeders. Some are easy to maintina by roguing out. I have some liberty which are staying quite good But they have a very easy to spot seed and any outbreeding seems to affect the bean very quickly and they are not the right colour or shape but very dark or white beans are impossible to spot the rogues. So it is not until you get a rather substandard bean the next year you know that things have gone wrong.Doing the business with a paint brush is a bit of a nightmare and I have only managed it with a very few beans at a time. I have been breeding my own beans and only get a one pod of each breed.