When summer landscapes call for visual drama, pollinator appeal, and resilience, few shrubs answer with as much reliability and style as Hibiscus syriacus 'Red Heart', also known as Red Heart Rose of Sharon. With its five white petals and vivid crimson eye, this cultivar delivers standout performance in urban, residential, and commercial designs alike.
Botanical Name: Hibiscus syriacus ‘Red Heart’
Common Name: Red Heart Rose of Sharon
Plant Family: Malvaceae
Type: Deciduous Flowering Shrub
Zones: 5–9
Height & Spread: 8-10 ft tall × 6-8 ft wide
Light Needs: Full Sun to Partial Sun
Soil Requirements: Adaptable; Prefers Well-Drained, Moderately Fertile Soils
Growth Rate: Moderate to Fast Once Established
Leaf Out: Mid to Late May
Leaf Structure: Three-Lobed, Medium-Green Leaves, Serrated Edge, and a Soft, Textured Surface
Bloom Period: July through September
Flowers: A Large Five Pedal White Bloom with a Crimson-Red Center and a prominent Yellow Stamen
Pollinator Value: High – attracts Hummingbirds, Butterflies, Bees
Use: Focal Point, Foundation Plantings, Seasonal Privacy Screen
Despite its exotic appearance, Hibiscus syriacus has a long history of cold-hardy cultivation. Native to eastern Asia, especially Korea and China, this species has been used ornamentally for centuries and holds cultural significance as Korea’s national flower. The ‘Red Heart’ cultivar was developed in the mid-to-late 20th century through selective breeding aimed at enhancing bloom vibrancy, floral form, and plant uniformity. Its striking contrast, refined structure, and abundant flowering quickly earned it widespread acclaim among gardeners and landscape professionals alike.
The Hibiscus syriacus ‘Red Heart’s crisp white blooms with vivid crimson centers deliver a tropical splash of color that no other hardy shrub can match in zones 5 through 9. This cultivar uniquely combines eye-catching drama, extended summer bloom, and true cold hardiness, ensuring year-after-year performance with minimal fuss.
Beyond its stunning beauty, Hibiscus syriacus ‘Red Heart’ plays a vital role in
Hibiscus syriacus ‘Red Heart’ is generally resistant to most pests and diseases, making it a reliable choice for low-maintenance landscapes. However, occasional issues can arise, most commonly aphids, Japanese beetles, and sometimes spider mites. Monitoring during the growing season is recommended to catch infestations early. Diseases such as leaf spots or powdery mildew are rare but can be mitigated with proper pruning to improve airflow and by avoiding overhead watering. Overall, Red Heart’s resilience minimizes the need for chemical interventions, supporting sustainable maintenance practices.
Hibiscus syriacus ‘Red Heart’ offers that unmistakable tropical impact with the hardiness and reliability. It elevates any design with bold color and long-lasting blooms without sacrificing hardiness. For landscapes that crave exotic beauty and proven performance, this is the must-have shrub to specify and plant.
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