Hibiscus syriacus ‘Diana’, commonly known as Rose of Sharon, is a standout deciduous shrub admired for its prolific flower production and exceptionally long blooming season. This particular cultivar is known for its large, pure white blossoms and reliable performance in the landscape. ‘Diana’ is valued by both gardeners and professionals seeking low-maintenance, high-impact ornamental shrubs.
Family: Malvaceae
Zone: 5-9
Type: Deciduous Shrub
Height: 8-12 ft
Spread: 6-10 ft
Leaf Structure: Ovate, 4 in. Long, Dense Foliage
Leaf Color: Dark Green
Leafing Out: April to May
Flower Structure: Large, 5-petal blooms, 3-5 in. in Diameter with
a showy staminal column while producing little to no seed
Flower Color: Pure White
Bloom Period: July through October
Light: Full to Partial Sun
Soil: Medium Moisture, Well-Drained, Rich Soils
Watering: Medium
Hibiscus syriacus ‘Diana’ was developed in the 1960’s in England as part of a breeding program aimed at producing sterile, non-invasive cultivars of Rose of Sharon. Introduced to the United States in 1971, ‘Diana’ quickly gained popularity as a welcomed improvement. In recognition of its outstanding ornamental qualities, ‘Diana’ was awarded the prestigious Royal Horticulture Society Award of Garden Merit in 1993 solidifying its place as one of the most reliable and admired cultivars of Hibiscus syriacus worldwide.
In the landscape, Hibiscus syriacus ‘Diana’ is a must-have for its versatility and enduring beauty. Its upright structure and luminous white blooms make it a striking specimen on its own, while its dense foliage and reliable height allow it to serve equally well as a hedge or privacy screen. Blooming steadily from July through October, it extends seasonal interest when many shrubs fade. This cultivar is tough enough for urban sites yet elegant enough for formal gardens. ‘Diana’ offers both resilience and refined charm - an ideal choice for designers and homeowners seeking a dependable showpiece that delivers year after year.
One of the standout qualities of Hibiscus syriacus ‘Diana’ is its exceptional pollinator value. Its large, open white flowers offer easy access to nectar and pollen, drawing in bees, butterflies, and even hummingbirds throughout the long bloom season. The prominent staminal column is rich with pollen, ensuring that visiting insects brush against it as they feed, aiding in effective pollination. Because the ‘Diana’ blooms when many other nectar sources are fading, it provides a crucial food supply for pollinators at a time they need it most making it a vital resource for ecological health.
While the ‘Diana’ gives much to the environment, it asks for little in return thriving with minimal care and straightforward maintenance. During the first growing season, regular watering is important to develop a strong root system, but mature plants tolerate summer heat and drought with ease. Well fertilized ground in the spring supports healthy growth and abundant blooms while a layer of mulch assists in retaining moisture and suppressing weeds. Pruning for the ‘Diana’ is best done in early spring or late winter to encourage vigorous new growth and larger flowers. Occasional shaping will help it maintain a tidy habit.
Hibiscus syriacus ‘Diana’ is generally a tough and reliable shrub, but like any plant, it can occasionally experience minor issues. Leaf spots, rust, or blight may appear from time to time, especially in wet or humid conditions, but these can usually be managed with good air circulation and watching for infected leaves. Insects such as Japanese beetles, aphids, or whiteflies might appear, but regular monitoring and simple measures are typically all that’s needed to keep the plant healthy and thriving. Overall, ‘Diana’ remains low-maintenance and resilient providing long-lasting beauty with very little fuss.
