Gardenia bud failure
Please, why do my gardenia buds go brown, first at the base, spreading up the formed bud and eventually perish and drop off without opening?
Certified GKH Gardening Expert
It is possible that you have thrips. They are hard to see and they cause damage to the buds like that. This article will help: https://www.gardeningknowhow.com/plant-problems/pests/insects/controlling-thrips.htm
This article will help if you feel it is not thrips: https://www.gardeningknowhow.com/ornamental/flowers/gardenia/gardenia-flowers-gardenia-buds-falling-off-plant.htm