Moonflowers are a close relative of the morning glory vine. Their large, white flowers bloom in the evenings and remain open all night. The vines quickly grow up any trellis or fence they are planted against, making them suitable as a living screen. Moonflowers require a long growing season in order to begin flowering in late summer. Start them inside in individual peat pots. Peat pots minimize the transplant shock to the sensitive moonflower roots, since the pots can be planted directly in the garden.
Rub one side of the moonflower seed with a fine-grit sandpaper just until the lighter inner seed coat begins showing. Moonflower seeds are tough and may not germinate unless the coat is first weakened.
Fill a bowl with warm water. Set the prepared moonflower seeds in the water and let them soak overnight to speed the germination process.
Fill individual peat pots with potting mix. Water the mix thoroughly so it is evenly moist throughout.
Sow one moonflower seed in each pot. Plant to a depth equal to twice the seed's width, or approximately 1/2 inch deep. Cover with plastic wrap and place in a warm room to germinate.
Remove the plastic wrap once sprouts appear, about seven days after planting. Place in a warm, sunny window, and water as needed to keep the soil moist.
Transplant moonflowers outside after all danger of frost has passed in your area. Dig planting holes 1 inch deeper than the height of the peat pot. Set the entire pot in the hole and cover with soil to 1/2 inch above the rim. Water as needed to keep the soil moist throughout the growing season.