Outdoor Gardenia Care: Gardenias are cold sensitive and may die during severe winters; therefore, gardenias are typically grown outdoors where the winter weather is reasonably tolerable, or grown in pots and moved indoors for winter. Fall or spring is the most suitable time for planting the gardenia bush.

As for outdoor gardenia care, you should keep in mind that when the gardenia plant is grown outdoors, it generally prefers to be kept in partial shade. Gardenias also prefer moist, but well-drained acidic soil with plenty of organic matter. Water gardenias regularly, even once the plant has finished putting out blooms. Prune the gardenia bush after flowering has ceased to remove spent blooms and untidy branches and to keep the plant in good condition.

Indoor Gardenia Care: The gardenia plant can also be successfully grown in containers and treated like houseplants indoors. However, when growing a gardenia bush indoors, you must keep in mind that it requires bright light and high humidity. The dry, short days of winter will likely be the most troublesome, especially if the gardenia bush is not given enough humidity. Moving plants to southern-facing windows and/or supplementing them with grow lights are good ways to improve light conditions during winter.

High humidity is essential to indoor gardenia care. Dry air will quickly cause the flowers to begin dropping from the plant. There are several ways to increase humidity in the home, including the use of a humidifier or grouping plants together on trays of wet pebbles. Misting the gardenia plant is not recommended, as this may cause problems with fungal leaf spot. The soil, which should be loose and organic, should be kept moist, but take care not to overwater. Monitor the soil frequently for moisture, and water thoroughly as the top inch of soil dries. The gardenia plant should also receive cooler nighttime temperatures and warmer daytime temperatures.