Plant Bio
Gardenias (Gardenia jasminoides) are tropical broadleaf evergreens, usually grown as large indoor potted specimens for the sake of their spectacular scented white flowers. The gardenia is a beloved plant for a very simple reason: Few natural scents are as remarkable, evocative, and memorable.
But the truth is that without the appeal of the spectacular scent, few gardeners would try to grow high-maintenance gardenias, which are vulnerable to many insects and diseases. They are most commonly found in conservatories and greenhouses. Nevertheless, even a few months with a blooming gardenia in the house makes them a worthwhile addition to your collection.
In the appropriate climate, gardenias can be planted in the garden in the spring or fall. They are generally planted from mature potted specimens that will bloom immediately. If you choose to try to grow gardenias from seeds, expect to wait two to three years before they flower.
Botanical Name - Gardenia jasminoides
Common Name - Gardenia, cape jasmine
Plant Type - Flowering broadleaf evergreen
Mature Size - 5–6 feet tall, similar spread
Sun Exposure - Part shade
Soil Type - Rich, well-drained soil; peat-based potting mix for container plants
Soil pH - 5.0 to 6.5 (acidic)
Bloom Time - Seasonal bloomer
Flower Color - White, cream
Hardiness Zones - 8 to 11 (USDA); often grown as a houseplant
Native Area - China, Japan, Taiwan
Toxicity - Flower is toxic to pets
Gardenia Care
Gardenias grow outside only in the USDA zones 8 to 11, across the South and the Pacific Coast. If you live in cooler climates, you can take your gardenia houseplant outside during the spring and summer after the temperature stays above 60 degrees Fahrenheit. But be careful to bring it indoors on any night when the temperature falls below that minimum and as soon as fall makes its appearance.
When planted in the garden, gardenias prefer rich, acidic soil that drains well. Amending the planting area with plenty of organic material is a good idea. Place gardenias in light or medium shade, in a location where they don't face competition from tree roots. Soil should be regularly covered with a thick layer of mulch to control weeds, as these plants don't care for cultivating.
A well-tended gardenia will be compact with deep green leaves, and will bloom in early spring to summer depending on location, when the nighttime temperatures are above 60 degrees Fahrenheit and daytime temps are between 75 and 82 degrees. When growing them indoors, this means you'll need to keep them in a room that's relatively warm during the day.