Should you dig your dahlias up and store them? Or can you leave them in the ground? How to dig up dahlias, where to store them and what happens if you leave your dahlias over winter for several Dahlias in winter! The pros and cons of digging them up Please note: You are currently browsing img dahlia gallery pablo longfield gardens that is 1000x1050px in size. This image is listed in landscaping ideas with dahlias category. Dahlias in winter The pros and cons of digging them up, 1000x1050 in 167.23 KB.