Gardenias 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 the very simple reason that few natural scents are as remarkable, evocative, and memorable. If not for this spectacular appeal, 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.