My Butternut pumpkin vines have died right back and although I got some nice ripe ones from them, there were three that were still greenish. I wondered if they’d be any good, so Googled ‘pumpkin ripening’ and found this hugely informative pumpkin growing site.
I’ve brought the three pumpkins inside and in the warmth of the kitchen they’re starting to slowly change to their ripe colour, so it looks like I might be in luck and not have to throw them out as I first thought.