How Much Water Do Moonflowers Need?

Identification

• Named for the fact that they bloom at night and close again in the morning, moonflowers are large-blossomed ornamentals with showy white blooms. They are also referred to as moon vine or flower of moon vine. Though they can grow to 70 feet in their native tropical environments, they usually only attain heights of 10 to 15 feet in a single growing season. With support, however, they can grow higher when grown as a perennial. Their 4- to 8-inch rounded, ovate leaves are light green and their large, white flowers bloom from June through October, depending on climate.

Water Needs

• Moonflower needs medium amounts of water, preferring consistently moist soil. They do not, however, grow well in soggy conditions, so plant them in well-drained sites. Moonflower is considered a water-efficient vine, so give it the minimum amount of water to keep the soil moist. They are, however, susceptible to drought, so do not let soil dry out entirely. Overwatering, which causes drowning and edema, can also be a problem, so only give the plant enough water for moist, well-drained soil.

Culture

• In addition to moist, well-drained soil, moonflowers appreciate sunny sites. They also need support to climb, so provide with a trellis or other structure on which to grow. When growing moonflower from seeds, you will also need to nick them and then soak them in water overnight. Start them indoors 6 to 8 weeks before the last frost date, if applicable in your area, and then plant outside. Direct seeding after the last frost date would likely mean missing the bloom.

Garden Uses

• Moonflowers grow in a climbing, trailing fashion that covers trellises, walls and other structures. Their cascading habit makes them an attractive garden feature even during the day, when their flowers are closed. They also grow well in hanging baskets or containers where they can trail over the edge. When grown on trellises next to decks or patios, they can create a screen. Because they conserve water well, you can grow them in low-water gardens as long as you keep the soil moist.