Rose of Sharon is actually a variety of hibiscus, which is native to Indian subcontinent and other Asian countries. Planting rose of sharon is possible in variety of zones as it is adaptable to multiple climates.
Blue Bird Rose of Sharon An incredibly beautiful shrub with an extraordinarily long flowering time! Saucer-shaped blooms with overlapping petals of azure-blue, accented by red-purple throats, are produced nonstop from midsummer to frost, opening 3-5" wide. Will form an open fan-shaped bush 6-8' tall and easily used for a screen or hedge. Ships in 4" pots. Zones 5-8 Hibiscus syriacus ‘Blue Bird’
How and when to prune......The rose of Sharon shrub flowers on growth from the current year, allowing optimum opportunities for when to prune rose of Sharon. Pruning rose of Sharon shrub may be necessary at times and this article can help.