Ornamental · Convolvulaceae
Morning Glory
Ipomoea purpurea
Set a few scarified seeds at the base of a trellis and morning glory turns a bare frame into a wall of trumpets by late summer.
Full sun
Every 5–10 days
50–95°F · 10–35°C
65–110 days
Overview
Morning glory is the vine that dresses a plain fence, arbor, or porch rail in fresh color, opening new trumpet flowers each morning and letting them soften away by afternoon. A fast twining annual from the warmer Americas, it takes to almost any upright it can reach, from a mailbox post to a chain-link run, and gains 6 to 10 feet across one season. Sky-blue reads as the signature, though purple, wine-red, white, and striped forms open up the palette for a scheme.
As a design partner it asks very little in return. Full sun, lean soil, and something to climb are nearly the whole brief, and rich ground works against the look by trading blooms for a heavier mass of leaves. Its one habit to plan around is easy generosity: the same pace that clothes a trellis by high summer can leave you tidying volunteers for years if the pods are left to open.
Two notes belong in the plan before the first seed goes in. The seeds carry toxic alkaloids that make them a real risk around pets, livestock, and anyone who might take them for food, so a household with curious animals or small children should site the vine with that in mind. And while this ornamental annual stays far more mannerly than its perennial cousin field bindweed, some Ipomoea species appear on noxious-weed lists, so a quick regional check keeps the season on the right footing.
Care
The short version: place it in full sun and lean, well-drained soil, water when the top half dries, give it a trellis to dress, and hold the fertilizer so the season delivers flowers rather than a heavy screen of leaves.
Light
Give morning glory full sun, meaning 6 or more hours of direct light where you set it. It will still climb in part shade, but the flowering thins out, so a bright, open wall or corner shows it at its best.
Water
Let the top half of the soil dry between waterings, then water deeply, which lands at roughly every 5 to 10 days. Once settled, the vine takes a dry spell in stride, and soggy soil does it more harm than a little thirst.
Soil
Lean ground suits it best. Plant in average to poor, well-drained sandy soil anywhere from a pH of 5.5 to 8.0, and leave it unenriched, since generous soil favors leaves over the flowers you planted it for.
Temperature
Morning glory is a warm-season vine, at ease from about 50°F to 95°F (10°C to 35°C). It has no frost tolerance, so wait until the cold has fully passed before setting plants out for the season.
Humidity
Ordinary outdoor humidity is all it asks, so there is no figure to manage. Hot, dry air is more apt to invite spider mites than to trouble the vine itself.
Feeding
This is a plant to leave unfed. Skip the fertilizer, or reach for only a low-nitrogen feed if anything, because rich soil and extra nitrogen build lush vines with hardly a flower to show for a wall.
Pruning
Pinch the young tips to steer the vine into a fuller, branching shape, and cut it back whenever it overruns its frame. Clip away the spent seed pods to keep it from sowing itself across the border.
Repotting
Morning glory is grown fresh from seed each year as an annual, so repotting never enters the plan. Start it where you want the season's climb and let it run its course.
Size & spacing
Plan for a vine of 6 to 10 feet (1.8 to 3 m) across one season, spreading 3 to 6 feet (90 to 180 cm) wide. Offer a sturdy trellis, string, or fence and enough room for the twining stems to shape the space.
When to plant
Morning glory runs on warmth and closes the show at the first hard frost, so its season sits squarely in the warm months. Start seeds indoors in early spring or sow them into warm ground once the cold has passed, and the vine carries colour from midsummer through to fall frost.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: 6-8 weeks before last spring frost; scarify and soak seed 12-24 hours
- Plant: 1-2 weeks after last spring frost when soil is warm; or direct sow after frost
- Harvest: midsummer to fall frost (about June to October)
Hardiness
USDA hardiness zones: 2–11
Temperature: down to -46°C
Troubleshooting
Most quibbles with morning glory come down to a shy display, a surplus of seedlings, or a brush with mites and aphids. Match the look below and act early, above all on self-seeding, which is far easier to keep ahead of than to walk back.
A curtain of green with the blooms missing
When a screen of foliage refuses to flower, the cause is almost always an overindulged plant, with rich soil or a nitrogen feed spending its energy on leaves rather than buds. Morning glory rewards a lean, sunny spot, so pull back on feeding and settle it somewhere that collects 6 or more hours of direct light. A young vine simply needs the season to turn, since the display holds off until midsummer.
Fix:
- Stop fertilizing and avoid nitrogen-rich amendments
- Move or grow in full sun (6+ hours)
- Be patient; blooms typically start midsummer and continue to frost
An encore of seedlings across the border
Left to its own devices, morning glory is a generous self-seeder, and pods that split scatter next year's crop across the planting. The following spring, heart-shaped leaves crowd the very spot the vine last held. Lifting the volunteers while they are young keeps the border composed, and trimming spent pods before they ripen keeps the whole scheme within its intended lines.
Fix:
- Pull unwanted seedlings while young
- Remove and discard spent seed pods before they shatter
- Deadhead flowers before seed set in areas where weediness is a concern
A dulled, speckled canopy losing its polish
When the leafy screen loses its shine and shows fine webbing, spider mites are usually at work, drawn in by hot, dry stretches. Aphids gather on the tender new growth, and leaf miners thread pale lines through the foliage that read up close as flaws in an otherwise clean display. A firm jet of water restores much of the look, insecticidal soap settles the holdouts, and steady watering keeps the canopy fresh enough to resist mites.
Fix:
- Spray plants with a strong jet of water to dislodge mites and aphids
- Treat persistent infestations with insecticidal soap or horticultural oil
- Remove heavily mined or chewed leaves
Toxicity
This is a vine to place thoughtfully in any home where curious pets or small children roam unsupervised. The seeds hold the real risk, carrying LSA alkaloids that bring stomach upset and hallucinations if swallowed, while the foliage rates a milder caution. Keep seed packets and dropped pods well out of reach.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Moderate
A stolen bite of leaf tends to leave a cat drooling and unwell. The graver worry lives in the seeds, where LSA alkaloids can turn a cat agitated, unsteady, and clearly disoriented.
Dogs Moderate
A dog that samples the foliage usually ends up with a queasy stomach and some vomiting. A mouthful of seeds is another matter, as the alkaloids bring on tremors, restlessness, and a drunken, stumbling gait.
Horses Moderate
Grazing the vine can sour a horse's gut and leave it listless. A heavier dose of seed carries things into neurologic territory, with twitching and a dazed, hallucinatory state.
Rabbits Moderate
The seed alkaloids that trouble cats and dogs reach rabbits just as surely, so this vine belongs well beyond their reach. A rabbit off its food, sitting hunched, or moving unsteadily is the signal to note.
Livestock Moderate
Cattle, sheep, and goats rarely choose it, yet a mouthful of seed-laden vine can bring colic and restless, agitated behavior. Clear stray morning glory from any pasture fencing the animals can reach.
Birds Caution
Consider morning glory off the guest list for pet birds. The seeds hold the strongest measure of alkaloids, so keep packets and fallen pods clear of cages and aviaries.
People Caution
Nothing on this plant belongs on the table. The seeds are genuinely hazardous, carrying LSA alkaloids that bring nausea and hallucinations, so keep them from children and never mistake them for food.
Keep seed packets and dropped seeds away from pets and children; the seeds are sometimes abused for their hallucinogenic alkaloids.
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
Poison Control: (800) 222-1222
Canada
Poison Centres: 1-844-764-7669
Varieties
Morning glory arrives in a broad sweep of colors along with a few close relatives worth knowing for a scheme. These are the ones you will meet most often.
Heavenly Blue (Ipomoea tricolor)
The image most people hold of the plant, its clear sky-blue trumpets opening from a pale white and yellow throat.
Grandpa Ott's
A deep-purple heirloom carrying a reddish-magenta star that runs up the center of each bloom.
Scarlett O'Hara
A wine-red to scarlet selection that sets a warmer note against the familiar blues and purples.
Flying Saucers / Pearly Gates (Ipomoea tricolor)
A matched pair, Flying Saucers swirling blue and white together while Pearly Gates keeps to pure white.
Moonflower (Ipomoea alba)
A night-blooming cousin whose large white flowers open through the evening and carry a sweet scent.
Cardinal climber / Cypress vine (Ipomoea × multifida / Ipomoea quamoclit)
Related climbers prized for fine, fern-cut foliage and small red star-shaped flowers.
How to propagate
Morning glory is raised from seed, and the single skill worth having is coaxing that hard seed coat to open.
SeedEasy
Start indoors 6-8 weeks before last frost or direct sow after frost when soil is warm · Germinates in about 1-2 weeks after scarifying/soaking; rapid growth once established
Morning glory begins and ends with seed, which keeps the whole project refreshingly simple. The seed coat is hard, so nick it with a file or sandpaper and let the seeds soak for 12 to 24 hours before they go in. Start them indoors 6 to 8 weeks ahead of the last frost, or sow straight into warm ground once frost has passed, and they rise within 1 to 2 weeks before climbing fast. Have a trellis, string, or fence set where you want the season's shape, ready for the twining vine as soon as it appears.
Myths
Morning glory and field bindweed are the same weedy plant.
The likeness is real, yet these are two different species. The ornamental morning glory grown for the garden is a warm-season annual in the genus Ipomoea, with showy 2-inch flowers and heart-shaped leaves that bow out at frost. Field bindweed is Convolvulus arvensis, a deep-rooted perennial noxious weed with smaller 1 to 1.5-inch white-to-pink flowers and narrow arrowhead leaves, and it is the one that carries the unwelcome reputation.