Ipomoea alba - Evening Glory
Ipomoea alba - Evening Glory
Ipomoea alba
Moonflower, Giant White Ipomoea, Evening Glory
Very disappointed :( out of the 10 seeds, only one germinated and by mid-July it's only this big. 70cm but it's very spindly, two sunflowers which, oddly, I didn't recognise the seeds of—perhaps they're special… we'll see. The rest haven't germinated.
Nathalie, 16/07/2025
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Description
On warm summer nights, as soon as night falls, the large round flowers, white or pale pink, of this Ipomoea alba, also known as Moonflower, emerge, betraying their presence with their fragrance. The flowers close before noon in sunny weather and stay open longer in cloudy weather. This plant, native to tropical America, is a giant perennial in its country of origin, but it shows rapid growth that allows us to cultivate it as an annual in our climates with hot summers. It will decorate the veranda or greenhouse with its dark green heart-shaped foliage in large containers, protecting it from our harsh winters. It is a generous but voracious plant, appreciating fertile soil, regular watering, and full sun.
Ipomoea alba is a perennial evergreen that flowers at night and in cloudy weather, originating from tropical and subtropical regions of the Americas, from northern Argentina to northern Mexico, and up to Florida. Formerly classified in the Calonyction genus, it is now assigned to the Ipomoea genus, belonging to the Convolvulaceae family. It is an herbaceous plant with voluble stems that can reach 30m (98ft) in its native habitats, when its vegetation is not destroyed by frost. When grown as an annual, it will reach about 3m (10ft) in all directions. Its leaves are entire or trilobed, measuring 5 to 15cm (2 to 6in) long, heart-shaped, and dark green. Flowering occurs from July to September, with large, very round flowers, pink or white, measuring 8 to 14cm (3 to 6in) in diameter, in wide funnel-shaped or almost flat corollas, highly fragrant, carried by long peduncles. They open quickly in the evening, remain open at night until the rays of the sun hit them in the morning. Flowering is followed by the formation of hard, pointed, ovoid capsules, measuring 2 to 25mm (0 to 1in) in diameter, containing seeds with sparse hairs that are easy to sow.
The Moonflower is a fabulous, generous plant that will climb a warm wall where it will find conditions reminiscent of its origins. A southwest exposure seems favourable to enjoy its flowers for longer in the morning. The heat radiated by the wall will be beneficial to it. It can easily be grown in large pots that can be placed on the terrace during the summer to fill the air with fragrance on summer evenings. It is only in the mildest areas of our country that it will truly show its perennial nature, taking up all the space required by its natural luxuriance. Ipomoea alba can also be grown in pots and pinched like chrysanthemums, which makes it very floriferous. Its flowers can also be used to decorate a table on a festive evening.
This plant gets its name from the fact that it blooms its flowers under the moon, but also from the lunar shape of its flattened corollas.
Ipomoea alba - Evening Glory in pictures
Flowering
Foliage
Plant habit
Botanical data
Ipomoea
alba
Convolvulaceae
Moonflower, Giant White Ipomoea, Evening Glory
South America
Planting and care
Sowing period
Intended location
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
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In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.