Because white flowers look spectacular in the moonlight, they are often used to create a "moonlight garden." Many flowers that bloom at night attract pollinating insects with their intense fragrance rather than brightly colored blossoms. White flowers that bloom at night are best planted near entrances or along pathways so passersby can enjoy their subtle nocturnal beauty and intoxicating fragrance.
Botanically known as Nicotiana alata, flowering tobacco is a night-blooming annual. Its tubular flowers grow on draping branches that are almost vine-like in that they spread along the ground, growing more horizontally than vertically. Flowering tobacco has an intense fragrance and a single plant can scent an entire yard.
Evening primrose (Oenothera spp.) is a fast growing annual that is rather nondescript during daylight. When darkness arrives the flowers open and reveal a mild lemony scent. Evening primrose can grow up to 8 feet tall, but most specimens are shorter. The flowers bloom at the end of the plant's major stems. Although it is night-blooming, the flowers will stay open past early morning on cloudy days.
Yucca (Yucca filamentosa) keeps its flowers open during the day. During darkness, the otherwise droopy flowers lift themselves up and release their fragrance. Yuccas produce their bell-shaped flowers on a six foot high stalk that grows from the plant's cluster of pointed evergreen leaves. Yucca grows in USDA Hardiness Zones 4 through 9.