Why are my gardenia leaves yellow?
Why Are My Gardenia Leaves Yellow
Certified GKH Gardening Expert
There are many reasons gardenias get yellow leaves. This article will help you pinpoint the problem on yours: https://www.gardeningknowhow.com/ornamental/flowers/gardenia/helping-a-gardenia-bush-with-yellow-leaves.htm
The cool night time Temps. and to much water in soil
that does not drain well is most likely the reason
when the night time temps warm a little more to a low of 60
try adding some Iron to the soil
and a good all perpose fertilizer.