Experiment fails

I am not surprised that my experiment to grow Sweet Potatoes from cuttings failed, as the crop is tiny. The propagation last January was successful, as was the planting out in the greenhouse but I feel that if July and August had been warmer months the outcome might have been different. The 2 largest tubers are  not viable, about the size of small carrots, and there are plenty much smaller. It was worth a try, but this is not something I will repeat.