When do they start and end blooming in NC?
Gardenia Bush Blooms
Certified GKH Gardening Expert
The USDA classifies NC as hardiness zone 7B. If proper conditions are given, gardenias bloom heavily in the late spring and then sporadically throughout the summer. Here is more information on gardenia blooming: https://www.gardeningknowhow.com/ornamental/flowers/gardenia/gardenia-care-to-get-a-gardenia-bush-to-bloom.htm