Just planted a very large double hollyhock plant with three mail stocks in a summy location and it is fading. We planted it where we had a large heather plant that we took out. Can you advise?
It could be suffering from shock. This article will help with that: https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm