Gardenias are popular shrubs and ornamentals in the southern part of the United States where severe cold won't damage the plants. Plants always seem to have more blooms at the time you receive them than any other time in their life due to less than favorable growing conditions in most homes.
Gardenias thrive on 68-74 degrees F temperatures in the day, and 60 degrees F evening temperatures. Plants prefer full sun indoors; if grown outdoors for the spring, summer and early fall, keep plants in partial shade. An east or covered west porch will be satisfactory.
High humidity is essential to gardenia care. Avoid misting the foliage, though, as leaf spot fungal problems will develop. The soil should be kept uniformly moist, but dont overwater. A loose, well-drained organic soil is recommended.
Fertilize monthly between April and November with an acid fertilizer.