Comfrey in a container is chlorotic
I have a container of comfrey in my greenhouse. It is very chartreuse with darker green veins. I watered in has-to-gro once a week, next wood ash, several days later I watered in Epsom salt, a few days later I watered in has-to-gro, a week or 5 later I tried alfalfa tea. Other than the coloring, it looks great, but the color doesn't look healthy. What does it want? Any suggestions?