I had a mum once that put on a lot of new spring growth and looked great. Then the temps plumented and we got a freak late spring ice, not just a frost, but a hard freeze. The mum never made a come back. I lost some iris that year too that had already made buds. They just didn't come back strong and some of them rotted and died. My lilacs got froze that year too. The early springs we have once in a while make me nervous.
