Why is my aquilegia going moldy?

Question

It has never dried out.

Answer 1

Downy mildew is most common in spring, where temperatures are cooler and rain is plentiful. Yellowing or mottling on leaves is common with a downy, gray or white coating on underside.
Powdery mildew is more common in late summer when humidity is high. Here is info on how to treat them:

https://www.gardeningknowhow.com/plant-problems/disease/downy-mildew.htm
https://www.gardeningknowhow.com/plant-problems/disease/powdery-mildew-homemade-and-organic-remedies.htm