Last fall we built several raised beds for veggies this year. We got a load of 30 yrs. old manure that was just beautiful soil by the time we got it. Today my onion sets were delivered. I am concerned it is too cool at night yet. It has been getting in the 20's yet. They look ok and I could store in a cool dry place but I don't know for how long. What should the temps be at night for them and Garlic??