Posted: 24/11/2011 at 15:28
Last year as a trial I left one Dahlia plant in a pot & it came back this year and it is flowering now. When the leaves were blacken by the frost I cut the top growth and left the tuber in the pot & kept it dry in the greenhouse. Around March I brought them inside onto a sunny windowsill and started watering the tubers and they started to grow. If you keep the pot dry you should be able to leave the tubers in their pots.