Hibiscus syriacus ‘Diana’

rose-of-sharon

  • © Richie Steffen / Great Plant Picks

Outstanding Qualities

This very hardy member of the hibiscus family has saucer- shaped, pure white blooms that, unlike most other rose-of-sharons, remain open into the night. This selection was made at the US National Arboretum for its prolific flower production and long flowering time-midsummer until late September or early October. Blooms reach up to 5 inches across and have slightly wavy petal edges. Rose-of-sharon's leaves turn yellow in autumn. This is a tough shrub that easily tolerates urban conditions, withstanding poor soils and, once established, dry conditions. It is great for hot sunny locations. 'Diana' is unable to produce weedy seedlings, which is a problem in warm regions.

Quick Facts

Plant Type: shrub

Foliage Type: deciduous

Plant Height: 10 ft. 0 in. (3.05 meters)

Plant Width/Spread: 6 ft. 0 in. (1.83 meters)

Plant Height-Mature: 0 ft. 0 in. (0.00 meters)

Plant Width-Mature: 0 ft. 0 in. (0.00 meters)

Hardiness: USDA Zones 5 to 9

Flower Color: white

Sun/Light Exposure: full sun

Water Requirements: occasional watering during dry weather

Seasonal Interest: autumn color

Wildlife Associations: butterflies, bees

Colors & Combos

Great Color Contrasts: variegated, gold, burgundy

Great Color Partners: lavender, pink, blue

Culture Notes
This rose-of-sharon produces its best bloom in full sun. It will thrive in well-drained soil, but is tolerant of poor sandy or clay soil as long as the drainage is adequate. Once established it only needs occasional watering during dry weather. If it is grown in sandy soils it may need water more regularly. Little pruning is needed to maintain its form. Remove dead, broken or poorly formed branches in winter. Rose-of-sharon can be late to leaf out in spring, but grows quickly once the weather warms.