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Hibiscus syriacus Blanco - Rose of Sharon

Hibiscus x syriacus Blanco
Common Hibiscus, Rose of Sharon, Syrian ketmia, St Joseph's rod, Garden Hibiscus

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Value-for-money
This hibiscus produces very large, single, 16 to 20 cm diameter flowers with white petals enhanced by carmine red at the centre. The bush has a moderate growth habit, reaching approximately 2.5 m in height and 1.5 m in width at maturity. It is hardy, drought-tolerant and can withstand temperatures as low as -15°C. Its long flowering period, from July to October, brings a bright and refined palette to the garden or terrace. Plant it in rich, well-drained soil, slightly alkaline to neutral.
Flower size
18 cm
Height at maturity
2.50 m
Spread at maturity
1.50 m
Exposure
Sun
Hardiness
Hardy down to -15°C
Soil moisture
Dry soil, Moist soil
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Best planting time March, October
Recommended planting time February to May, September to November
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Flowering time July to October
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Description

Hibiscus syriacus Hibisa® 'Blanco' is a variety of althea from the excellent Hibisa® series, combining numerous qualities: it produces extra-large, highly contrasted flowers from summer to autumn, and the bush is easy to grow in the garden or in a pot. A spectacular, hardy, drought-tolerant variety!

Belonging to the Malvaceae familyHibiscus syriacus, also known as althea or rose of Sharon, originates from the temperate regions of East Asia, particularly China, Korea, and Taiwan, where it grows wild on the edges of forests or along waterways. Introduced to Europe via the Mediterranean basin, it has given rise to numerous cultivars and hybrids. Crossed with Hibiscus paramutabilis, this species produces plants with exceptionally large flowers.

The Hibisa® Blanco cultivar belongs to the Hibisa® series, developed for its very large flowers and versatility. This deciduous bush can reach 2.5 m in height and 1.5 m in width at maturity when planted in the ground, and around 1.5 m in a pot. Its large, single white flowers with a carmine-red centre, which emerge from the axil of the leaves, measure between 16 and 20 cm. They bloom continuously from July to October. The foliage of the Hibiscus in the Hibisa® series is unusual and quite decorative. The leaves are arranged alternately on the stems; they are generally single but deeply lobed and finely toothed, sometimes almost ruffled. Each leaf consists of 3 to 5 deep lobes, with distinctly wavy or crinkled margins, giving a palmate appearance to the foliage. The leaves vary in size from 5 to 12 cm in length and 4 to 10 cm in width, with a slightly leathery texture and a colour ranging from bright green to dark green. The foliage is deciduous, falling in autumn and reappearing in spring, often late in the season, as is typical of all Hibiscus syriacus. A tap root system anchors the bush firmly and provides good drought resistance. The greyish stems, marked with lenticels, enhance its rustic charm.

Hibiscus Hibisa® Blanco is ideal for structuring a sunny flower bed, enriching a country hedge, or adding volume to a terrace. To create a dynamic and contrasting composition, pair it with a salvia ‘Amistad violet’ with very dark floral spikes and a Phormium ‘Sundowner’ with bronze-pink foliage. To enrich the floral palette, plant an Echinacea purpurea ‘White Meditation’ nearby. This combination will create an interesting scene in a contemporary or Mediterranean-style garden.

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Hibiscus, Althaea: planting, growing and care
Family sheet
by Valérie 13 min.
Hibiscus, Althaea: planting, growing and care
Read article

Hibiscus syriacus Blanco - Rose of Sharon in pictures

Hibiscus syriacus Blanco - Rose of Sharon (Flowering) Flowering
Hibiscus syriacus Blanco - Rose of Sharon (Foliage) Foliage

Plant habit

Height at maturity 2.50 m
Spread at maturity 1.50 m
Habit spreading
Growth rate slow

Flowering

Flower colour two-tone
Flowering time July to October
Flower size 18 cm

Foliage

Foliage persistence Deciduous
Foliage colour dark green

Botanical data

Genus

Hibiscus

Species

x syriacus

Cultivar

Blanco

Family

Malvaceae

Other common names

Common Hibiscus, Rose of Sharon, Syrian ketmia, St Joseph's rod, Garden Hibiscus

Origin

Cultivar or hybrid

Product reference24659

Planting and care

Plant Hibiscus syriacus Hibisa Blanco in early spring or early autumn. Container planting is possible all year round. Choose a sunny spot, as full light is essential for generous flowering. Plant it in deep, rich, well-drained soil with a neutral to slightly alkaline pH; in overly acidic or heavy soil, add organic-lime supplement or well-rotted compost to improve the structure. In the ground, dig a hole twice as wide as the root ball and position the young plant. Water thoroughly after planting and at regular intervals during the first few months to help it establish well. Once established, hibiscus tolerates drought well but will appreciate regular watering during extreme heat. Organic mulch can be added around the base to reduce evaporation and naturally enrich the soil.

In containers, use a pot at least 40 cm in diameter with good drainage at the bottom and a substrate made of horticultural compost, compost, and coarse sand. Potted hibiscus requires regular watering from spring to late summer.

Hibiscus can be susceptible to powdery mildew, and black aphids and mealybugs may attack it.

 

Available to order
5,90 €
Available to order
11,90 €
Available to order
17,50 €

Planting period

Best planting time March, October
Recommended planting time February to May, September to November

Intended location

Suitable for Meadow
Type of use Border, Free-standing, Container, Hedge
Hardiness Hardy down to -15°C (USDA zone 7b) Show map
Ease of cultivation Beginner
Planting density 1 per m2
Exposure Sun
Soil pH Neutral, Calcareous
Soil type Clayey-chalky (heavy and alkaline), Silty-loamy (rich and light)
Soil moisture Dry soil, Moist soil, deep, rich, well-draining

Care

Pruning instructions Remove faded flowers regularly to encourage more flowering. Each year, at the end of winter, prune the bush by cutting it back to maintain its compact habit. It can withstand hard pruning.
Pruning Pruning recommended once a year
Pruning time March
Soil moisture Dry soil, Moist soil
Disease resistance Good
Overwinter Can be left in the ground

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