Coelestis Rose of Sharon.
Gorgeous radiant clear and clean blooms, the Coelestis Rose of Sharon (Hibiscus syriacus 'Coelestis') features huge, violet-blue, tropical-looking flowers cover this large vase-shaped shrub starting in mid-summer and continuing on through fall! Not many other flowering shrubs bloom during this time, so get ready for compliments. The flowers themselves are very showy, with deep, heathery blue petals held in an open style.
Called "single" blooms, this really means... - Coelestis Rose of Sharon.