As with much of the eastern half of the U.S., my season is running 3-4 weeks ahead of normal, and we have had the warmest March on record. The first frost predictions in weeks came April 10 with a forecasted 29F(-2C). I am usually a degree colder. Well, my thermometer read 21F(-6C) that morning, and it was quite a surprise. I had brought a few potted materials into the garage, but not many. forecasts were modified for the next night, to be the same as what was just experienced, so I did bring in a few more things, just in case it got worse, which it did by a degree.
Consequently, the temperature test case has revealed some interesting results. Most plants were unaffected. No need to show them. But there has been some interesting results (at least for me) with both things I would have expected to fair well, but didn't, and things I would have expected to suffer, but didn't.
I'll start with the Losers:
Aralia cordata var. sachalinensis and Magnolia sieboldii (leaves)
Corydalis cheilanthifolia, the day after, and three days after
Iris suaveolens, yellow and purple forms. Pics taken three days after showing fresh flowers and cold damaged flowers.
Impatiens balfourii seedlings all died, but Impatiens glandulosa alba survived.