This is the first year I tried container gardening. I have hyacinth that are 3 inches tall in 4 inch clay pots. Also tulips, crocus and hyacinth in as large as 12 clay pots. Last night I was too tired to throw a blanket over the pots. This morning I woke up and some of the pots were FROZEN SOLID. After months of TLC--everything was looking SO good--have I damaged or killed my bulbs? Anne PS: Global TV said temps would drop to -4 or -5 last night.