Photo by Melody

PlantFiles: Mountain Hydrangea
Hydrangea serrata 'Blue Billow'

Family: Hydrangeaceae (hy-drain-jee-AY-see-ee) (Info)
Genus: Hydrangea (hy-DRAIN-juh) (Info)
Species: serrata (sair-AY-tuh) (Info)
Cultivar: Blue Billow

» View all varieties of Hydrangeas

2 vendors have this plant for sale.

7 members have or want this plant for trade.

36-48 in. (90-120 cm)

4-6 ft. (1.2-1.8 m)

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

Unknown - Tell us

Bloom Color:
Light Blue

Bloom Time:
Mid Summer
Late Summer/Early Fall


Other details:
This plant is attractive to bees, butterflies and/or birds
Average Water Needs; Water regularly; do not overwater
Requires consistently moist soil; do not let dry out between waterings

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

Patent Information:
Unknown - Tell us

Propagation Methods:
By dividing the rootball
From softwood cuttings
From semi-hardwood 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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There are a total of 15 photos.
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5 positives
1 neutral
No negatives

Gardeners' Notes:

Positive RemyO On Jun 14, 2014, RemyO from Tonawanda, NY (Zone 6b) wrote:

After a very long colder than normal winter here in zone 6, it is covered in flower buds.

Positive NewMerciesFarm On Jun 18, 2012, NewMerciesFarm from HADLYME, CT wrote:

This is a great plant to appreciate in the shade in the dog days of July. In the right light the blue is electric and visitors are always drawn to the plant.

While all the US vendors refer to the species as serrata, Van Gelderen's Encylopedia of Hydrangeas lists it as Hydrangea Macrophylla (lacecap group) v. Blue Billow. Can anyone illuminate this point?

Positive rkwright85 On Sep 27, 2011, rkwright85 from Horton, MI (Zone 5b) wrote:

Has been a strong grower and flowers well for me. I live in southern MI (zone 5b) and have it planted on the east side of my house for some winter protection. May need frequent watering if exposed to very much sun or wind.

Positive gardeneve On Jun 7, 2009, gardeneve from Roslindale, MA wrote:

This hydrangea is my best bloomer--no problems at all with later winter freezing of buds. The blue is so intense and the flowers last a long time. However it has not gotten as big as I expected--three years in my garden and it's still only a couple of feet tall (about 4 feet wide).

Positive Kristi_L On Mar 22, 2007, Kristi_L from Kalamazoo, MI wrote:

Does beautifully planted facing east with full sun until noon near the faucet so it gets plenty of moisture.

Neutral lupinelover On Jan 20, 2003, lupinelover from Grove City, OH (Zone 6a) wrote:

The buds are hardier than most cultivars, making it more likely to bloom in marginal areas. A spreading growth habit. Flowers are deep blue with dark centers.


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

Marietta, Georgia
Saint Joseph, Illinois
Baltimore, Maryland
Catonsville, Maryland
Olney, Maryland
Roslindale, Massachusetts
Horton, Michigan
Warren, Michigan
Colts Neck, New Jersey
Mount Laurel, New Jersey
Tonawanda, New York
Broken Arrow, Oklahoma
Atlanta, Texas

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