Gardenia: Gardenias are known for their luscious, white blooms, their intensely sweet fragrance, and unfortunately, their finicky nature. They need a lot of bright, but not direct, sunlight, scads of humidity, controlled temperatures, and plenty of food. With proper care, you'll enjoy the coiled blooms and the syrupy aroma these flowers are famous for.
Lilac: Better known for purple blossoms, the lilac bush nonetheless comes in a variety of shades, including white. If you want the sweet scent of lilacs in the spring, paired with the appeal of pure, white blooms, you can have the best of both worlds with white lilacs, which are stunning alone or in a bouquet featuring purple shades, as well.