When I harvested my Charlotte potatoes in the Summer there were a few green ones thanks to the blackbirds digging around in the dry compost looking for good. Rather than put them into the compost, I saved them in hessian bags in a dark shed and in mid August replanted them in old plastic sacks full of soil/compost with the idea of moving them into a greenhouse if we started to get frosts and harvesting them at Christmas.
A month after planting they were starting to look good, with shoots making it out of the soil.
