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The first method of propagation is direct sowing the seeds in the spring after the last danger of frost or else in the fall where they will lie dormant until spring. Although this is the simplest method, the random nature of outdoor-sown germination may frustrate some gardeners, especially those in geographic areas cooler than hardiness zones 11 to 8a. (The USDA Plant Hardiness Zone Map will let you know what zone you live in if you're unsure.)
There are several alternative ways to start moonflower plants for those gardeners who prefer more control over the process than direct sowing. The first technique is to score and then crack the seed's tough hull with a small file or sharp hobby knife. (You may also try cracking the seed with a small hammer or similar tool, but this is riskier as you may end up with some crushed seeds.) Once the hull is breached, the seed may be planted in a pot containing a light mix of potting soil and peat moss, watered, set in a warm area and allowed to germinate. Bear in mind that patience is a virtue when growing moonflowers; germinating times are less predictable than many other plants and may take from 5 to 14 days.
Moonflower seeds may also be prepared by soaking. Put the seeds in a bowl of water and let stand for two days and plant as above. The seeds may also be wrapped in a damp paper towel until they germinate, and then transplanted either to a small pot or, if the danger of frost has passed, outdoors.
If all else fails, it's possible that Moonflower plants may be available at your local nursery in the spring, but an October 2009 survey of mail-order and online nurseries unfortunately reveals that moonflowers are only widely available by seed.
Regardless of whether you buy or start your moonflowers yourself, plant them outdoors in an area with full sun and moderately dry, slightly acidic soil. If you're concerned about the quality of your soil, pH testers are inexpensive and readily available in garden and home centers. When planting, remember that your new moonflower is a vine that will grow as tall as 10 feet, so it will need the support of a fence post, trellis or other similar support. When planting also consider placing your new moonflowers near walkways or porches where everyone can best enjoy their large fragrant flowers when they bloom on warm evenings.
