I dug them up, dried them off and carefully stored them in a frost free place keeping them ‘just moist’ so they wouldn’t dry out, checked every week and carefully brought them back into growth on the heated bench in the greenhouse in April. These were the ‘Bishop’s Children’ dahlias grown from seed and much admired in the front ‘hot’ border. After lifting them I dug over the border between the perennials, added compost and left everything to nature which then kindly provided three very cold months with frequent heavy and prolonged frosts. And yet…….up they have come again! The couple of tubers I missed, left in the open ground all winter with no added protection and probably speared with the border fork!
Sometimes I think we try too hard and underestimate a plant’s ability to survive. Of course, I don’t know how many other tubers were left and didn’t!