Bud formation takes place at daytime temperatures of around 70 degrees and nights of around 60 degrees. Plants kept indoors require as near full sunlight as you can provide.
Outdoors shade during the hottest part of the day is best.
Gardenias should be kept evenly moist and fertilized with an acid type fertilizer such as Miracid. Despite its love of humidity do not mist the leaves of this plant as that can lead to fungus problems.