Hibiscus syriacus Red Heart - Rose of Sharon
Hibiscus syriacus Red Heart - Rose of Sharon
Hibiscus syriacus Red Heart - Rose of Sharon
Hibiscus syriacus Red Heart - Rose of Sharon
Hibiscus syriacus Red Heart
Common Hibiscus, Rose of Sharon, Syrian ketmia, St Joseph's rod, Garden Hibiscus
Superb plant and flowers. Came through the winter well.
Mireille, 06/05/2026
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Description
Hibiscus syriacus 'Red Heart' is an old variety of hibiscus that has become a classic in our gardens. From the beginning of summer until the first frost, this deciduous bush is adorned with large flowers of pure white with a beautiful dark red heart in the centre. Not very vigorous and of medium size, it is a cultivar that needs to be pruned every year and is especially suitable for flower beds and pots. The hibiscus is a hardy shrub that can be grown in full sun or partial shade, in well-drained soils that are not too dry. It can even tolerate limestone soils.
Hibiscus syriacus, sometimes called Garden Althaea, is a very hardy, deciduous shrub. However, its foliage persists in winter in warm climates. It belongs to the Malvaceae family, just like mallows, hollyhocks, and marshmallow. It is native to temperate regions of Asia (China, India), and has given rise to many cultivars including 'Red Heart', an old selection from the breeder Gulf Stream Nursery (United States) dating back to before 1965.
Hibiscus syriacus 'Red Heart' is characterised by slow growth and an exceptionally generous flowering. This variety quickly forms a bush 2 m (6.6 ft) tall and on average 1.5 m (4.9 ft) wide, with an upright habit, supported by an erect but harmoniously branched framework. It usually blooms from the second half of July and lasts until early autumn if the weather remains mild. Its ephemeral flowers, which fade within 24 hours, continually renew themselves until October. They are single, 8 cm (3.1 in) wide, and composed of pure white petals with a heart mottled with dark red, arranged around a central column of pure white, composed of stamens and pistil. Its foliage is slightly glossy and of a dark olive-green colour. It turns yellow in autumn before falling. The leaves are alternate, simple, heart-shaped, and lobed; their edges are dentate and undulate.
'Red Heart' requires no maintenance; it grows slowly but steadily. Plant it in full sun, in soil kept slightly moist until the end of summer. This attractive variety can be used as a medium-sized free hedge, in combination with other hibiscus of different colours, wild roses, mock oranges, lilacs, and butterfly bushes that will bring the fragrance it lacks. It can also be planted as a stand-alone specimen or at the back of a perennial border, composed of daylilies, asters, or shrub salvias, for example.
Hibiscus syriacus Red Heart - Rose of Sharon in pictures
Plant habit
Flowering
Foliage
Botanical data
Hibiscus
syriacus
Red Heart
Malvaceae
Common Hibiscus, Rose of Sharon, Syrian ketmia, St Joseph's rod, Garden Hibiscus
Cultivar or hybrid
Planting and care
Plant in spring or autumn, in a sunny position or in partial shade in sunnier regions, in well-drained, deep, loose, fertile soil that remains moist at depth. Dig a generous planting hole, add some compost and sand to improve soil quality if necessary. Water generously after planting. Don't worry if the vegetation doesn't start before May, it's perfectly normal for this bush. Its hardiness is around -20° C (-4° F) for a mature plant. This bush can be grown in almost all regions, except those that are really cold in winter.
While shrubby hibiscus can tolerate heat and occasionally dry soils, they are more beautiful and flower more abundantly in soil that retains moisture in summer. Mulch the base of these generous shrubs if needed and water if necessary.
Planting period
Intended location
Care
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).
The flowering period indicated on our website applies to countries and regions located in USDA zone 8 (France, the United Kingdom, Ireland, the Netherlands, etc.)
It will vary according to where you live:- In zones 9 to 10 (Italy, Spain, Greece, etc.), flowering will occur about 2 to 4 weeks earlier.
- In zones 6 to 7 (Germany, Poland, Slovenia, and lower mountainous regions), flowering will be delayed by 2 to 3 weeks.
- In zone 5 (Central Europe, Scandinavia), blooming will be delayed by 3 to 5 weeks.
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 planting period indicated on our website applies to countries and regions located in USDA zone 8 (France, United Kingdom, Ireland, Netherlands).
It will vary according to where you live:
- In Mediterranean zones (Marseille, Madrid, Milan, etc.), autumn and winter are the best planting periods.
- In continental zones (Strasbourg, Munich, Vienna, etc.), delay planting by 2 to 3 weeks in spring and bring it forward by 2 to 4 weeks in autumn.
- In mountainous regions (the Alps, Pyrenees, Carpathians, etc.), it is best to plant in late spring (May-June) or late summer (August-September).
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.