Photo by Melody

PlantFiles: Panicle Hydrangea, Tree Hydrangea
Hydrangea paniculata 'Unique'

Family: Hydrangeaceae (hy-drain-jee-AY-see-ee) (Info)
Genus: Hydrangea (hy-DRAIN-juh) (Info)
Species: paniculata (pan-ick-yoo-LAY-tuh) (Info)
Cultivar: Unique

» View all varieties of Hydrangeas

3 vendors have this plant for sale.

2 members have or want this plant for trade.

8-10 ft. (2.4-3 m)

4-6 ft. (1.2-1.8 m)

USDA Zone 3a: to -39.9 C (-40 F)
USDA Zone 3b: to -37.2 C (-35 F)
USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)

Sun Exposure:
Sun to Partial Shade

Parts of plant are poisonous if ingested

Bloom Color:

Bloom Time:
Mid Summer
Late Summer/Early Fall
Mid Fall


Other details:
Average Water Needs; Water regularly; do not overwater
Requires consistently moist soil; do not let dry out between waterings
Flowers are good for drying and preserving

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)

Patent Information:
Unknown - Tell us

Propagation Methods:
From softwood cuttings

Seed Collecting:
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

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Gardeners' Notes:

Neutral lmelling On Dec 4, 2004, lmelling from Ithaca, NY (Zone 5b) wrote:

Information from both "Hydrangeas for American Gardens," by Michael A. Dirr (2004) and "Encyclopedia of Hydrangeas" C.J. and D.M. Van Gelderen (2004 - Timber Press).

'Unique' was grown and introduced in 1968 by the de Belders for its large, pure white sterile florets (about 2" across) and rounded sepals. The showy sepals almost completely conceal the fertile flowers. The inflorenscences may reach 16 inches long by 10 inches wide. A fairly large shrub which should grow 10 - 14 feet high. Later flowering, approximately mid-July in zone 7b.

This cultivar is horribly confused in nursery commerce, and seldom is the true form. Prof. Dirr comments in the above publication that he has grown 3 so-called 'Unique' shrubs, none were true to description above. He states that Ted Stephens, Nurseries Caroliniana, North Augusta, SC was able to secure the true 'Unique' from the curator of Hillier Arboretum, and now offers these as true Unique (see 'True Unique').

Van Gelderen, in the above text states that the cultivar is a medium-sized shrub up to 8' and at least as wide, with weak branches (which is why the plants are often very wide). Flowers are creamy white, in large panicles. As these two descriptions are at odds with the plant size and color of the panicles, it should be up to the individual gardener to decide whether s/he has the true cultivar or not.

See more information under 'True Unique'


This plant has been said to grow in the following regions:

Sioux Center, Iowa
, Manitoba
Lakewood, Ohio
Norristown, Pennsylvania
Menasha, Wisconsin

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