I’ve been having a bumper crop of runner beans this year, with plenty picked all through summer. I am leaving the last for shelling for seed and eating but something odd is happening. There are some lovely big green bean pods, but they have been lovely and big and green for the past few weeks. They aren’t getting bigger, so they’ve reached full size, but they’re not drying and going brown. I have Emergo, Scarlet Emperor, White Lady and Gigantes and they are all like this, even though they’re all in different areas and conditions. Should I leave them until the frost hits, or pick them now even though they are still green?