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PlantFiles: Smooth Hydrangea
Hydrangea arborescens subsp. discolor 'Sterilis'

 
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Family: Hydrangeaceae (hy-drain-jee-AY-see-ay) (Info)
Genus: Hydrangea (hy-DRAIN-juh) (Info)
Species: arborescens subsp. discolor
Cultivar: Sterilis

Synonym:Hydrangea arborescens var. sterilis

Height:
4-6 ft. (1.2-1.8 m)

Spacing:
4-6 ft. (1.2-1.8 m)

Hardiness:
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)
USDA Zone 8b: to -9.4 °C (15 °F)

Sun Exposure:
Sun to Partial Shade
Light Shade

Danger:
Unknown - Tell us

Bloom Color:
White/Near White

Bloom Time:
Unknown - Tell us

Foliage:
Blue-Green

Other details:
Unknown - Tell us

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
7.9 to 8.5 (alkaline)

Propagation Methods:
From softwood cuttings

Seed Collecting:
Unknown - Tell us

Profile:

1 positive
No neutrals
No negatives

Gardeners' Notes:

RatingAuthorComment
Positive lmelling On Dec 10, 2004, lmelling from Ithaca, NY
(Zone 5b) wrote:

Subspecies discolor 'Sterilis', can be confused with 'Grandiflora'; but, it has a flatter-topped head , showing some areas of small perfect fertile flowers that are not covered by the sepals of the showy flowers. The corymbs are more uniform (not as lumpy), nor as rounded as those of H. arborescens 'Annabelle'.

Plants are 5' to 6' high. The old name that is occasionally used is Hydrangea cinerea 'Sterilis'.

Information from "Hydrangeas for American Gardens," by Michael A. Dirr (2004)



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