Hibiscus syriacus Ultramarine (Rose of Sharon)
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Hibiscus syriacus Ultramarine (Rose of Sharon)

Rose of Sharon Ultramarine, Shrub Althea Ultramarine, Hibiscus syriacus 'Minultra'


Hibiscus syriacus Ultramarine (Rose of Sharon) is a vigorous, upright, deciduous shrub noted for its single deep violet-blue flowers, up to 4 in. across (10 cm), adorned with a dark red throat. Blooming from midsummer to early fall, each flower lasts about one day and stands out against the green foliage of maple-like leaves. A very useful, structural shrub for the back of the border.

  • Recipient of the prestigious Award of Garden Merit of the Royal Horticultural Society.
  • Typically grows up to 5-8 ft. tall (150-240 cm) with a spread of 4-7 ft. (120-210 cm).
  • Performs best in full sun in neutral, humus-rich, moist but well-drained soils. Protect the roots in winter with an organic mulch. Drought tolerant once established.
  • Plant in shrub borders for dramatic summer blooms. Great flowering shrub for foundation plantings, hedges, city gardens, cottage gardens, wall-side borders.
  • Keep an eye out for aphids, scale insects, mealybugs, whiteflies or powdery mildews. Deer resistant.
  • Little or no pruning required. Prune to keep desired form in early spring. Pruning back to 2-3 buds in late winter may produce larger blooms.
  • Propagate by softwood cuttings in late spring, by semi-ripe cuttings in summer, or by layering in spring or autumn.
  • Hibiscus syriacus species is native to south-central and southeast China.
  • Find where this species is invasive in the United States.
  • Discover beautiful U.S. native plant alternatives.

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Requirements

Hardiness 5 – 8
Heat Zones 1 – 8
Climate Zones 2A, 2B, 3A, 3B, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, H1
Plant Type Shrubs
Plant Family Hibiscus
Exposure Full Sun
Season of Interest Summer (Mid,Late)
Fall
Height 5' – 8' (150cm – 240cm)
Spread 4' – 7' (120cm – 210cm)
Spacing 48" – 84" (120cm – 210cm)
Water Needs Average
Maintenance Low
Soil Type Loam
Soil pH Neutral
Soil Drainage Moist but Well-Drained
Characteristics Plant of Merit, Showy
Tolerance Deer, Salt
Attracts Butterflies, Hummingbirds
Garden Uses Beds and Borders, Hedges and Screens
Garden Styles Coastal Garden, Informal and Cottage

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Bailey Nurseries Inc

While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 5 – 8
Heat Zones 1 – 8
Climate Zones 2A, 2B, 3A, 3B, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, H1
Plant Type Shrubs
Plant Family Hibiscus
Exposure Full Sun
Season of Interest Summer (Mid,Late)
Fall
Height 5' – 8' (150cm – 240cm)
Spread 4' – 7' (120cm – 210cm)
Spacing 48" – 84" (120cm – 210cm)
Water Needs Average
Maintenance Low
Soil Type Loam
Soil pH Neutral
Soil Drainage Moist but Well-Drained
Characteristics Plant of Merit, Showy
Tolerance Deer, Salt
Attracts Butterflies, Hummingbirds
Garden Uses Beds and Borders, Hedges and Screens
Garden Styles Coastal Garden, Informal and Cottage

Great Plant Combination Ideas with Hibiscus

Guides with Hibiscus

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