Moonflower Vine (Ipomoea alba) Growing Guide: Night-Blooming Fragrance

Moonflower (Ipomoea alba) is a magical nocturnal vine native to southern Florida and the American tropics. Its large, trumpet-shaped white flowers unfurl at dusk, perfume the night air, and close by morning. The blooms resemble a full moon, hence the name. In the 19th century, garden parties were held to watch them open. Hardy in USDA zones 8–11, vines reach 5–30 feet with heart-shaped leaves. Perfect near patios, bedroom windows, or outdoor dining areas for evening fragrance.

Site Selection

Plant where vines can climb—fences, trellises, arbors. Provide support for twining stems. Site along evening walkways for fragrance enjoyment.

Climate and Soil

• Adaptable to various soils; prefers moderately fertile.
• More sun = more blooms. Plant outdoors when temperatures consistently stay 60–70°F.
• Light requirements flexible; full sun to partial shade.

Seeding and Planting

1. Nick seeds and soak in warm water 4–8 hours (overnight ideal).
2. Start indoors 4–6 weeks before last frost in warm soil for germination.
3. After frost, transplant outdoors. Ideal germination temp: 65–85°F.
4. Germination in ~3 weeks. Thin to one vine per pot.
5. Transplant carefully: dig hole larger than peat pot, plant pot and all. Pot disintegrates, adding nutrients.
6. Water thoroughly after planting.

Watering

Water small plants gently and regularly. Large vines need more water. Avoid overwatering—soggy soil plus intense sun causes bud drop.

Fertilizing

• Apply liquid fertilizer once or twice in late summer.
• High-phosphorus fertilizer encourages blooms.
• Avoid excess nitrogen (promotes leaves over flowers).

Pruning

• Perennial vines (zones 8–11): Cut to ground in fall; mulch roots for winter. Or prune late winter/early spring. Disinfect tools.
• Dead/damaged vines: Remove to prevent disease spread and improve light/air penetration.
• Shape control: Trim branches in desired growth direction.

Pest Control

Moths and hummingbirds love the nectar. Pests rarely serious; spray with water or natural repellents. For severe infestations, use organic/chemical insecticides and fungicides.

Toxicity Warning

All parts, especially seeds, are toxic if ingested. Keep away from children and pets. Not poisonous to touch.

Self-Seeding

Moonflower self-sows readily. Remove seedpods to prevent unwanted spread.

Pair with morning glories for a spectacular 24-hour floral display—moonflowers by night, morning glories by day.