Q.Potted Gardenia
How often do gardenias bloom? What causes brown spots on the leaves?
Certified GKH Gardening Expert
Brown leaves or brown spots on gardenia leaves are usually caused by the following: Water splashed on the leaves when watering the plant, pH of the soil is wrong, pests on the plant, not enough sunlight (they need 6 to 8 hours), not enough humidity, or poor drainage (check for "wet feet").
As for the blooming, here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/flowers/gardenia/gardenia-care-to-get-a-gardenia-bush-to-bloom.htm