Morning Glory (Annual)

A fast-growing annual vine with trumpet-shaped flowers in blue, purple, pink, and white that open each morning. Morning glories can cover a fence or trellis in a single season and self-sow enthusiastically. Nick or soak the hard seeds before planting and provide support for the twining vines.

Nick the hard seed coat with a file or nail clippers, or soak seeds in warm water for twenty-four hours before planting to break dormancy. Direct sow outdoors one-half inch deep after the last frost when soil is warm. Seeds germinate in five to ten days at 65 to 85 degrees Fahrenheit. For earlier blooms, start indoors in individual peat pots two to three weeks before the last frost. Do not start too early, as vines become tangled and difficult to transplant. Transplant carefully without disturbing the taproot.

Morning glories are best direct-sown outdoors after the last frost when soil temperatures have warmed to at least 65 degrees Fahrenheit. Nick the hard seed coat with a file or soak seeds overnight in warm water to speed germination. Plant seeds one-half inch deep and six inches apart at the base of a trellis, fence, or other support structure. Seeds germinate in five to ten days in warm conditions.

Provide a sturdy support immediately, as vines grow rapidly and can reach ten to fifteen feet in a single season. Morning glories climb by twining counterclockwise, so vertical strings, wires, or lattice work best. Full sun is essential for abundant blooming, and lean soil is actually preferable, as fertile soil promotes excessive foliage with fewer flowers.

Water moderately during establishment, then reduce to minimal irrigation. Morning glories are drought-tolerant once established and bloom most heavily under slight stress. Avoid fertilizing, especially with nitrogen, as this produces vigorous leafy growth but delays and reduces flowering. Remove seed pods to control self-sowing, which can be aggressive in warm climates. The seeds are toxic if ingested.

Morning glories create a living privacy screen on fences and trellises, providing shade for heat-sensitive plants below. They pair beautifully with moonflowers for round-the-clock blooms on the same support structure. Plant with sunflowers, which can serve as natural supports for the vines. Avoid planting near food crops, as the seeds are toxic. Morning glories attract hummingbirds and bumblebees, making them valuable in pollinator-friendly gardens.

Morning glories actually prefer poor to average, well-drained soil with a pH of 6.0 to 6.8. Rich, fertile soil produces vigorous leafy vines with few flowers. Do not amend the soil with compost or fertilizer before planting. Only feed if plants appear stunted or yellowed, using a low-nitrogen phosphorus-rich fertilizer to promote blooms. Container-grown morning glories may need occasional light feeding. Sandy or gravelly soil is ideal for maximum flower production.

Ideal Temperature

Hardiness Zone Compatibility

Morning glory flowers are short-lived, each bloom lasting only one day, so they are not ideal for cutting. Enjoy them on the vine instead. For seed saving, allow seed pods to dry completely on the vine until they turn brown and papery, then crack open and collect the triangular black seeds. Seeds are easy to save and store. Morning glory vines can be cut and woven into decorative wreaths in autumn after frost kills the foliage. Handle seeds with care, as they are toxic if ingested.

Storage & Preservation

Morning glory flowers cannot be preserved as cut flowers due to their one-day bloom cycle. Individual blooms can be pressed between heavy books for crafting. Seeds are the primary thing to save, and they store excellently for three to five years in paper envelopes in a cool, dry location. Label saved seeds with variety name and harvest date. Dried vines can be fashioned into rustic wreaths. Do not eat or allow children to handle the seeds, as they contain toxic compounds.

Troubleshooting Common Problems

The most common complaint is all leaves and no flowers, which results from overly rich soil, excessive nitrogen fertilizer, or insufficient sunlight. Plant in lean soil in the sunniest spot available. Aggressive self-sowing makes morning glories potentially invasive in some regions, so check local regulations before planting. Seeds are toxic and should be kept away from children. In short-season climates, late sowing may result in plants that do not bloom before frost arrives.

Growing Tips

1. Scarify seeds by nicking the hard outer coat with a nail file or soak them in warm water for 24 hours before planting to improve germination rates from around 50 percent to over 90 percent.
2. Direct sow seeds outdoors only after the soil has warmed to at least 18°C (65°F), as cold soil causes seeds to rot before germinating.
3. Plant morning glories in full sun with at least six to eight hours of direct sunlight daily for the best flower production. Partial shade results in lush foliage but significantly fewer blooms.
4. Provide sturdy vertical support such as a trellis, fence, arbor, or string netting before the vines begin their rapid growth phase, as established vines are difficult to redirect without damage.
5. Water deeply once per week rather than shallow daily watering to encourage deep root development. Morning glories are moderately drought-tolerant once established.
6. Avoid over-fertilizing, especially with nitrogen-rich products. Lean to moderately fertile soil produces the best balance of foliage and flowers. Excess nitrogen creates abundant leaves but delays blooming.
7. Deadhead spent flowers regularly during the blooming season to redirect the plant's energy from seed production into generating new buds and extending the flowering period.
8. If self-seeding is a concern, remove seed pods before they mature and split open. Morning glories can become weedy in mild climates where seeds overwinter successfully in the soil.
9. Space plants 15 to 30 centimeters (6 to 12 inches) apart along the base of a support structure. Closer spacing creates a denser screen but may increase competition for water and nutrients.
10. In short-season climates, start seeds indoors in biodegradable peat pots four to six weeks before the last frost date. Transplant the entire pot to avoid disturbing the sensitive taproot.