How to Grow Silky Morning Glory
Silky Morning Glory
Ipomoea alba
vineSilky morning glory is a vigorous tropical climbing vine renowned for its large, fragrant white trumpet-shaped flowers that open in the evening and close by morning. Also called moonflower, this plant produces silky-textured blooms and can grow 10-15 feet in a single season. It's a tender perennial often grown as an annual in cooler climates.
When should you plant Silky Morning Glory in your zone?
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Example Silky Morning Glory timeline · Pittsburgh, PA (Zone 6b)
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Plant Silky Morning Glory
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Silky Morning Glory
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Silky Morning Glory dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 10-11; grown as annual in zones 3-9
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Germination & Seedling
10-14 days to sprout; 3-4 weeks to transplant-ready sizeSeeds sprout with emergence of first true leaves; seedlings are tender with heart-shaped cotyledons.
Soak seeds overnight or scarify seed coat to improve germination. Keep soil warm (70-80°F) and consistently moist. Provide bright light once sprouted. Harden off gradually before transplanting.
Vegetative Growth
4-6 weeksRapid vine development with increasingly larger heart-shaped leaves on twining stems; no flowers yet.
Provide sturdy support structure (trellis, arbor, fence). Train vines as they grow. Apply balanced fertilizer every 2-3 weeks. Pinch tips early to encourage bushier growth if desired.
Budding
2-3 weeksFlower buds form at leaf axils; buds are greenish and elongated, gradually developing their distinctive shape.
Continue moderate fertilization, shifting toward lower nitrogen (higher phosphorus). Ensure consistent moisture and full sun exposure. Reduce fertilizer nitrogen to encourage flowering over foliage.
Flowering
4-6 months (mid-summer through first frost in cooler zones; year-round in tropics)Large, silky white trumpet flowers bloom, typically opening in late afternoon/evening and closing by morning. Flowers are highly fragrant, especially at night.
Maintain consistent watering and sunlight. Deadhead spent flowers to encourage continued blooming. Monitor for pests attracted to flowers. Enjoy the evening fragrance.
Seed Development & Dormancy
3-4 weeks pod development; winter dormancy in zones below 10Flowers fade and are replaced by round seed pods that mature from green to brown. Frost kills vines in cold climates.
Allow some flowers to go to seed if you want self-sowing next year. Collect seed pods when fully dry and brown. In frost-prone areas, cut back dead vines after frost and mulch perennial roots.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with water to dislodge; use neem oil or insecticidal soap if infestation is severe. Improve air circulation.
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Use yellow sticky traps; spray with insecticidal soap or neem oil. Remove heavily infested leaves.
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Hand-pick in early morning. Use pheromone traps placed away from the plant or apply spinosad-based insecticide.
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Spray with strong water stream; use insecticidal soap or neem oil. Encourage beneficial insects like ladybugs.
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Handpick or shake onto cloth to remove. Use neem oil or insecticidal soap for heavy infestations.
Uses
Traditional beverage ingredient
CulinaryIn some cultures, silky morning glory flowers are used to make herbal teas or floral beverages. The flowers are edible when prepared properly, though this use is less common than ornamental cultivation. [source]
Traditional medicine
MedicinalVarious Ipomoea species have been used in traditional medicine systems for laxative and digestive properties, though silky morning glory's primary modern use is ornamental rather than therapeutic. [source]
Evening garden fragrance
HouseholdSilky morning glory's intensely fragrant, night-blooming flowers make it ideal for evening gardens and night-scented borders. The sweet, jasmine-like aroma is most pronounced from dusk through midnight. [source]
Cut flower arrangements
CraftThe large, pristine white flowers are prized for tropical and evening-themed floral arrangements, though their brief opening window requires careful timing and immediate use. [source]
Pollinator and hummingbird plant
WildlifeThe large fragrant flowers attract night-flying moths and evening-active insects, supporting nocturnal pollinators. The abundant nectar makes it valuable for evening wildlife gardens. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Silky morning glory is primarily grown for ornamental flowers rather than harvest. To collect seeds: allow several flowers to mature into seed pods, wait until pods turn brown and dry completely (late fall), then carefully collect and open pods to extract black seeds. Store seeds in cool, dry conditions for next season. Cut flowers can be enjoyed indoors, though they close quickly once picked; gather in early evening just before full opening for best display.
Fun Facts
- 🌱 Silky morning glory's common name 'moonflower' comes from its spectacular night-blooming behavior: flowers remain tightly closed all day, then suddenly open in the late afternoon, releasing an intense sweet fragrance that can fill an entire garden.
- 🌱 The flowers are perfectly adapted for nocturnal moths: their pure white color is highly visible in low light, they emit their strongest fragrance at night, and they produce copious nectar to fuel these large pollinators.
- 🌱 Unlike its cousin the common morning glory, silky morning glory is a tender perennial from tropical regions, meaning it can survive winter and regrow from roots in zones 10-11, but must be replanted annually in colder climates.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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