Every year my cardinal flowers seem to get very tan at the base of the plant, and then the whole plant wilts and eventually dies. Can you tell me what the problem is and how to correct it?
Certified GKH Gardening Expert
It is likely to be a Pythium root rot. This infection will remain in the soil.
This article will help: https://www.gardeningknowhow.com/plant-problems/disease/root-rot-in-garden-plants.htm