Moonflowers will grow from dropped seeds, so if you don't want them to come back the following year and/or you live in USDA Hardiness Zones 9 to 11, pick off the faded flowers before they form seeds. In cold-winter regions, moonflowers will not return.

Will moonflowers grow back?

You can also cut the vines back in late winter or early spring. This forces new growth that quickly forms new vines. Because the moonflower blooms on the new wood, this produces a flush of new blooms each season. Always disinfect your pruning tools before and after cutting back your moonflowers.

Can moonflowers survive winter?

Moonflower plants are winter-hardy perennials in zones 10-11, but in cooler zones, they can be grown effectively as annuals. ... Mulch the roots of moonflowers in southern zones, and dig them up for winter storage in colder areas. Light requirements for growing moonflowers are adaptable, but more sun equals more blooms.