The flowers open over a long period of time, from May through July. Fall or spring is the best time for planting. Plant in light to moderate shade, preferably with minimum competition from tree roots. Gardenias resent root disturbance. They also grow well in pots.
Gardenias prefer acid, moist, well-drained soils.
Add plenty of organic matter, such as compost or ground bark, to as large an area as possible. Mulch plants instead of cultivating. A good time to feed gardenias is mid-March, using an acid plant food, fish emulsion or blood meal. Feed the shrubs again in late June to encourage extra flowers on everbloomers or faster growth of young shrubs. Do not fertilize gardenias in the fall.