About the Rose of Sharon - Diana :
The Diana Rose of Sharon, Hibiscus syriacus Diana, is an upright, deciduous shrub that is a vigorous, erect, multi-stemmed shrub that typically grows 8-12' tall. This shrub may also be trained as a single trunk tree or espalier. Leaves are diamond-shaped, dark green, slightly palmate and toothed. 'Diana' bears whiteflowers with yellow stems from late summer until mid-fall. This plant really requires no pruning, unless you need to remove a dead or damaged branch.
Long, early-summer to fall bloom period. This cultivar is a sterile triploid that produces very few if any seed pods. Excellent flowering shrub that may be massed, planted in groups or used as a specimen. Very tolerant of summer heat and humidity. Larger flowers may be obtained by pruning back hard to 2-3 buds in early spring. Otherwise, prune to shape.