Light Green Leaves on Gardenia
Why does my gardenia have light green leaves, rather than the rich looking dark green leaves?
Certified GKH Gardening Expert
It sounds like chlorosis, which is an iron deficiency, either caused by too little iron or too little nitrogen (which prevents iron uptake). Here is more information on that problem and how to fix it: https://www.gardeningknowhow.com/plant-problems/environmental/leaf-chlorosis-and-iron.htm