Dahlia tuber question
I hope teddahlia or another experienced dahliaholic can answer this question. I grow 50-60 dahlias each year and don't have enough room to start them in pots. I always direct plant tubers. Our last frost date is mid-May and I usually wait another week to be safe. The weather hasn't been kind the last couple years (rain) and sometimes I'm planting into June. Since I'm not starting a plant, if I were to plant the tubers a week or so earlier than our last frost date, how cold would it have to get to hurt the tubers planted 4-5" deep? I'm assuming the sprouts wouldn't be through the soil for a couple weeks. I didn't have blooms last year until September and I"d like to speed the process up a little.