Getting Gardenias to Bloom Flowers.
My gardenia tree form consider a "Tropical" on Georgia. Stopped Blooming. I moved it around to a AM sum/PM shade spot. The Greenery is lush and gorgeous. I re potted it and fertilized it.
Certified GKH Gardening Expert
Gardenias are very picky about their environment. Anything off at all, and it will fail to bloom.
It is most likely stressed from moving, and could possibly be overfed. Lush growth with no flowers would indicate way too much nitrogen in the soil, and/or not enough potassium and phosphorus.
This article will offer more information: https://www.gardeningknowhow.com/ornamental/flowers/gardenia/no-flowers-on-gardenia.htm