University of Illinois Extension
University of Illinois Extension - Selecting Shrubs for Your Home
http://www.urbanext.uiuc.edu/shrubselector
Rose of Sharon, Shrub Althea
Hibiscus syriacus
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Rose of Sharon form
Size:

Small
Size: medium
Medium

Large
Exposure/ Light Requirements:
Full Shade not required.
Full Shade
Full Sun required.
Full Sun
Partial Sun/Shade required.
Partial Sun/Shade
Hardiness Zone: 5 - 8 
Mature Height: 9-12 Feet
Mature Width: 6-10 Feet
Features: Large flowers in late summer (flowers may be single or double; white, red, purple or pink).
Culture: Full sun to partial shade; moist, well-drained soil; tolerant of alkaline soils.
Cultivars:

Numerous cultivars including:

  • 'Aphrodite' - Dark pink flowers with a dark red center.
  • 'Ardens' - Double rosy purple flowers.
  • 'Blue Bird' - Sky blue flowers with a small red center.
  • 'Diana' - Pure white flowers.
  • 'Jeanne d'Arc' - Double white flowers.
  • 'Lucy' - Double red flowers.
  • 'Red Heart' - White flowers with red center.
Mature Form: Upright to slightly spreading
Native To: China, India
Soil Conditions:
Dry
Soil condition: Moist, Well-DrainedMoist, Well-Drained
Wet
Tolerance:
Tolerance: Alkaline SoilAlkaline Soil
Dry Sites
Salt
Soil Compaction
Wet Sites
Tolerance: WindWind
Uses:
Barrier
Use for: Border.Border
Foundation
Hedge
Massing
Naturalizing
Use for: Screen.Screen
Use for: Specimen.Specimen
Foliage Color: Green
 
Fall Foliage Color: Green
 
Additional Notes: Annual pruning in early spring will improve flowering.