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Hydrangea arborescens is a southeastern U.S. native shrub with a rounded habit to 5 feet tall and domes of creamy white flowers over a long period beginning in early summer. The cultivar 'Grandiflora' has larger, showier flowerheads than the species. They grow to 6 to 8 inches across.  

It's the pink 'Annabelle' hydrangea! Invincibelle Spirit is as hardy and adaptable as 'Annabelle' but produces loads of hot pink flowers from early summer to frost. It's a reliable bloomer in the north and is also heat tolerant. -Proven Winners

(1 user review)

This is one of the most widely recognized species of hydrangeas. It boasts a plentiful number of cultivars. The species is divided into two groups: the Hortensias (or "mopheads") have globe-shaped flowers made up of large male flowers, and the Lacecaps have flattened flower heads, with central, female blossoms ringed in larger, male blossoms. 

This compact shrub bears attractive deep green leaves and large, rounded flower heads of deep pink in neutral soil, and intense violet-blue in acidic soil.

This re-blooming mophead features inflorescences ranging 4-6 inches wide. Their color will be pink or blue depending on aluminum availability in soil. Compact habit with glossy dark green leaves.

This is a well-loved and vigorous cultivar with large, rounded flower heads of a rich, gorgeous blue.

'Pia' is a dwarf Hortensia (or "mophead"), with globe-shaped flower heads made up of deep rose, 4-inch-wide flowers. 

This mound-forming shrub has white leaf margins and blue or pink lacecap inflorescences.

From Proven Winners: A small plant with strong stems and big, heavy magenta and white variegated flowers. The blooms are long lasting and can be changed from magenta-red to blue with the addition of aluminum sulfate to the soil. The flowers age to an attractive green with age. This compact, mildew resistant hydrangea is ideal for containers!

This plant produces gracefully arching branches and pyramidal clusters of white, then pink-tinged to dusky purple blossoms.

Large, sometimes giant white flower heads reaching 6 to 18 inches long turn pinkish with age. 'Grandiflora' is a fast-growing shrub that can reach 25 feet tall. Hydrangea paniculata is one of the most cold-hardy species. It may be grown as a single-stemmed tree specimen or as a multi-stemmed shrub. 

(3 user reviews)

This variety of the popular panicle hydrangea boasts very large, lime green blooms in mid-summer that turn pink in fall. A deciduous shrub, it grows to 8 feet tall and 6 feet wide with large, mid-green leaves. The blooms make good cut and/or dried flowers, but can be left on the plant for winter interest.

(1 user review)

'Tardiva' is a late-flowering (early to late autumn) cultivar with loosely-packed, sharply pointed white flower heads that turn purplish-pink with age. It is a vigorous, fast growing deciduous shrub that reaches 8 to 12 feet tall.

(1 user review)

'Unique' bears 8-inch-long white flower heads that fade to pinkish white. It is similar to, but more vigorous than, Hydrangea paniculata 'Grandiflora'. The cultivar name refers to the shape of the flower heads; they are broad at the base and rounded at the tip.  

(2 user reviews)

Oakleaf hydrangeas originated along the sandy streams of the southeastern United States, and they are more drought tolerant than many other hydrangeas. Their matte green leaves are coarsely textured and deeply lobed, and in fall they turn red and purple. White flower heads form in spring, and as summer draws to a close they turn shades of pink, green, and ecru. -Nellie Neal, Regional Picks: Southeast, Fine Gardening issue #127

Oakleaf hydrangeas are already one of my favorite shrubs: They are tough and reliable; have great foliage, flowers, and fall color; and provide stems of dried flowers in winter. Just when I thought they could not get any better, chartreuse-foliaged ‘Little Honey’ came along. Creamy white flowers appear in summer, then dry on the plant for months of show. ‘Little Honey’ rarely requires pruning, besides some thinning or shaping. To brighten the shade even more, plant hot pink or orange flowers and bright purple-foliaged tropicals nearby. -Irvin Etienne, Fine Gardening #147 (October 2012), page 72

This cultivar produces 8-inch-long, conical flower heads from early summer on. It is as notable for its distinct, deeply lobed leaves as for its reliably showy, creamy blooms. The foliage produces outstanding fall color and the flowers take on purplish-pink hues when dried.

This cultivar has large flowerheads of intricate double blossoms layered on top of one another. It is as notable for its distinct, deeply lobed leaves as for its reliably showy, creamy blooms. The foliage produces outstanding fall color, and the flowers take on purplish-pink hues as they dry. 

(2 user reviews)

This species was formerly grouped with the Lacecap hydrangeas because of its flattened flowerheads that consist of central, small florets surrounded by showy, larger florets. It is similiar to H. macrophylla but is a more compact plant with smaller flowers and leaves.