Garden Pests and Diseases: Sickly Bottle Gentian, 2 by Chillybean

Chillybean wrote:
We planted three Bottle Gentian (Gentiana andrewsii) dormant bare roots last fall. They all have received about the same watering. Mostly just rain, but on occasion when we were dry I gave them some. They all have come up, but one looks rather ill: stunted growth, lighter green and spotty.

I\'ve seen a type of mildew on some of my native plants in other areas, but that usually shows up later in the season, so it doesn\'t effect the growth or flowering too much.

The first image is one of the healthy plants and the other is my sick one. This is in one of my dryer spots and on the south side of the house. Does anyone know what it might be?

Thank you for any help.