Answer: Go ahead and cut it back, it is dead anyway. It will grow back (really quickly) in the spring. The first year I had one the frost turned it brown and brittle so I assumed it was dead and cut it all the way to the ground. Then...Presto! It came back with a vengeance in the spring. I cut it down every fall, it comes back every spring and puts on more growth with every year. However, one of mine is 3 years old now and still has not bloomed. I have learned this is not uncommon and with trumpet vines patience is a virtue.
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