Moonflowers are perennial vines that are grown more as annuals. They are related to the morning glory but their uniqueness lies in the fact that they bloom at night instead of during the day. The beautiful, large fragrant flowers are wonderful to have growing on a trellis or fence near your patio or porch where you sit in the evening. Moonflowers are easy to grow and can reach a height of 12 to 18 feet in a single growing season.
Prepare the soil by digging the area where you will be planting and working in few handfuls of compost. The location should be in full sun to some afternoon shade. Planting should take place in early spring, after the last threat of frost.
Soak the seeds in water for a few hours before planting. Place 2 or 3 seeds per hole, 1/2 to 1 inch deep in the soil and if you are planting more than one, they should be spaced about 6 feet apart.
Place the trellis in at the same time or before you plant the seeds so you don't damage the roots. Or, plant just inside a fence the plant can climb. Be careful not to shade the area the moonflower vine will come up.
Water thoroughly to encourage root growth. Keep the soil moist while the roots are getting established. Once the plant is established, water when the soil feels dry about twice a week. Water more frequently when it is very hot and dry.
Thin seedlings to the strongest plant in each location. Mulch around the seedlings to keep in moisture and keep down weeds.
Pinch off dead flowers to encourage new flowers to grow. It is normal to see ants around moonflower vines as they like the flowers. You do not need to use an insecticide as they won't harm the plant.