One might say that moonflower is morning glory’s counterpart. Ever the cheerful early bird of the garden, morning glory (Ipomoea purpureum) opens its stunning trumpet flowers with the first rays of the morning sun. Moonflower (Ipomoea alba), on the other hand, opens its lovely trumpet-shaped blooms at dusk, and are oftentimes the stars of evening moon gardens. Anyone who has grown moonflower, or their day-blooming cousin, has probably quickly learned that these vines need regular pruning to keep them in check and looking their best. Continue reading to learn how to prune a moonflower plant.
Cutting Back Moonflowers
Moonflowers are beloved for their lightly, sweet scented, trumpet-shaped white to purple flowers, which bloom from dusk to dawn. Perennials only in warm climates of U.S. hardiness zones 10-12, moonflower vines are grown as annuals in cooler climates, where they have no trouble covering whatever structure you place them on.
With its rapid and rampant growth, gardeners who prefer a tidy, tame garden may find themselves trimming moonflower plants three times a year to control their shape and growth. Because it blooms on new wood, moonflower pruning can be done at several times of the year. Generally, however, moonflowers are cut back to the ground in autumn. The root zone of perennial moonflowers is then mulched for winter protection.
From autumn to early spring, annual moonflowers can be cut back or pulled out to make room for the next season’s plants. However, moonflowers have decorative seed pods which add interest to the garden in late summer through fall. Many gardeners choose to delay cutting back moonflowers to allow these decorative seeds to form. Seeds can then be harvested and stored to produce new moonflowers the following season.
How to Prune a Moonflower Plant
Whenever pruning anything in the garden, only clean, sharp tools should be used to reduce the risk of disease. When pruning moonflower to shape, remove any crossing or crowding branches to open up the center to good air circulation and sunlight.
Also, cut back or retrain wild vines growing away from the trellis or support, or vines that have begun to trail along the ground or on other plants. When left unchecked, Ipomoea plants can choke out their companions.
If you enjoy trimming and training plants, moonflower is an excellent candidate to grow and train into a tree form or artistic espalier.
It is important to note that as a member of the nightshade group of plants, handling moonflower has caused skin irritations in some people. Always wear gardening gloves and wash hands frequently when handling moonflower plants.