Mountain Hydrangea
Hydrangea serrata 'Acuminata'

Family: Hydrangeaceae (hy-drain-jee-AY-see-ee) (Info)
Genus: Hydrangea (hy-DRAIN-juh) (Info)
Species: serrata (sair-AY-tuh) (Info)
Cultivar: Acuminata
Additional cultivar information:(aka Intermedia)
Synonym:Hydrangea serrata subsp. acuminata
» View all varieties of Hydrangeas

Height:

24-36 in. (60-90 cm)

Spacing:

24-36 in. (60-90 cm)

Hardiness:

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)

USDA Zone 9a: to -6.6 C (20 F)

Sun Exposure:

Sun to Partial Shade

Danger:

All parts of plant are poisonous if ingested

Handling plant may cause skin irritation or allergic reaction

Bloom Color:

Green

Violet/Lavender

Bloom Time:

Late Spring/Early Summer

Mid Summer

Foliage:

Deciduous

Other details:

Requires consistently moist soil; do not let dry out between waterings

Suitable for growing in containers

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)

Patent Information:

Unknown - Tell us

Propagation Methods:

From softwood cuttings

From hardwood cuttings

Seed Collecting:

Unknown - Tell us

Regional

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

Southold, New York

Gardeners' Notes:

0
positives
1
neutral
0
negatives
RatingContent
Neutral

On Jan 18, 2005, lmelling from Ithaca, NY (Zone 5b) wrote:

True 'Acuminata' is a slender shrub up to 3 feet, with large green fertile flowers, only sparsely surrounded by lilac ray-flowers, the corymbs are small, and the leaves are pointed.

According to the authors of "Encyclopedia of Hydrangeas" C.J. and D.M. Van Gelderen (2004 - Timber Press), there is much confusion whether 'Intermedia' is identical to 'Acuminata' as can be seen in French nurseries. Plants grown in European nurseries are most probably not the original 'Acuminata', which was introduced by Siebold as a species. Haworth-Booth named this taxon H.japonica 'Intermedia' thus creating the confusion. They suggest that perhaps the taxon no longer exists in Europe.

From Prof. Dirr's description of this plant in his "Hydrangeas for American Gardens," it app... read more