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PlantFiles: 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

One vendor has this plant for sale.

24-36 in. (60-90 cm)

24-36 in. (60-90 cm)

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

All parts of plant are poisonous if ingested
Handling plant may cause skin irritation or allergic reaction

Bloom Color:

Bloom Time:
Late Spring/Early Summer
Mid Summer


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


No positives
1 neutral
No negatives

Gardeners' Notes:

Neutral lmelling 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 appears that what is thought of as this cultivar is - as in Europe - no longer the true form.

Dirr's description of 'Acuminata' is: "flat medium green crinkled leaves come to a narrow point; stems are red speckled; good autumn color on seedlings. 3-3-1/2' tall by 3-3-1/2' wide. Sepals heavily serrate, pointed 3s(4s); facing downward and showing green reverse after pollination. Flowers early to mid-summer. Blue sterile & fertile flowers (acid soil), white aging to pink in alkaline." This varies greatly when compared to the flower color description in the original plant.


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

Southold, New York

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