Mountain Hydrangea 'Blue Billow'

Hydrangea serrata

Family
Hydrangeaceae (hy-drain-jee-AY-see-ee)
Genus
Hydrangea (hy-DRAIN-juh)
Species
serrata (sair-AY-tuh)
Synonym
Height
36-48 in. (90-120 cm)
Spacing
4-6 ft. (1.2-1.8 m)
Hardiness
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
Bloom Color
Light Blue
Bloom Time
Mid Summer
Late Summer/Early Fall
Foliage
Deciduous
Other Details
Other details
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
Soil pH requirements
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
Patent Information
Foliage Color
Bloom Characteristics
This plant is attractive to bees, butterflies and/or birds
Water Requirements
Average Water Needs; Water regularly; do not overwater
Requires consistently moist soil; do not let dry out between waterings
Where to Grow
Regional

This plant is said to grow outdoors in the following regions:

Marietta, Georgia

Saint Joseph, Illinois

Baltimore, Maryland

Catonsville, Maryland

Olney, Maryland

Roslindale, Massachusetts

Spencer, Massachusetts

Horton, Michigan

Warren, Michigan

Colts Neck, New Jersey

Mount Laurel, New Jersey

Tonawanda, New York

Broken Arrow, Oklahoma

Camden, Tennessee

Atlanta, Texas

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Gardener's Notes:

6
positives
1
neutral
0
negative
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A
Greenfield, TN | May 2019 | positive

We live in zone 7 and Blue Billow it is always beautiful. From the previous comments, mostly the negative ones were from much colder zon...Read More

R
R
Tonawanda, NY (Zone 6b) | June 2014 | positive

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

N
HADLYME, CT | June 2012 | positive

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 alway...Read More

R
Horton, MI (Zone 5b) | September 2011 | positive

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 so...Read More

G
Roslindale, MA | June 2009 | positive

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 ...Read More

K
Kalamazoo, MI | March 2007 | positive

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

L
Grove City, OH (Zone 6a) | January 2003 | neutral

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

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