We had a LOT of rain the last week, so the soil is still moist. I did water them in a little, but not a full drenching. I will water them again today though.
My experience with canna is that they are very hardy. I have some in nearly complete shade and try do great (don't flower a lot, but otherwise tall and healthy), even shooting up from under a bush as they have spread.
I transplanted 5 or 6 that day and all of the others are looking great. Maybe I accidently damaged this one in the process? Bottom leaves still look good, and there is s little one shooting up that looks ok. I'll take your advice and water good and hope for the best.