Mountain Hydrangea 'Blue Bird'

Hydrangea serrata

Family: Hydrangeaceae (hy-drain-jee-AY-see-ee) (Info)
Genus: Hydrangea (hy-DRAIN-juh) (Info)
Species: serrata (sair-AY-tuh) (Info)
Cultivar: Blue Bird
Additional cultivar information:(aka Bluebird)
» View all varieties of Hydrangeas


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

Light Shade


All parts of plant are poisonous if ingested

Bloom Color:



Bloom Time:

Mid Summer



Other details:

Unknown - Tell us

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:


Propagation Methods:

Unknown - Tell us

Seed Collecting:

Unknown - Tell us

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

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

Where to Grow:

Grow outdoors year-round


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

Cottonwood, California

Rehoboth Beach, Delaware

Acworth, Georgia

Marietta, Georgia

Evansville, Indiana

Barbourville, Kentucky

Louisville, Kentucky

Baltimore, Maryland

Earleville, Maryland

Silver Spring, Maryland

Benton Harbor, Michigan

Constantine, Michigan

East Tawas, Michigan

West Orange, New Jersey

Southold, New York

High Point, North Carolina

Painesville, Ohio

Wheelersburg, Ohio

Tunkhannock, Pennsylvania

Bristol, Rhode Island

Lawrenceburg, Tennessee

Fort Worth, Texas

Nacogdoches, Texas

Tyler, Texas

Lexington, Virginia

Sterling, Virginia

Virginia Beach, Virginia

Kirkland, Washington

Seattle, Washington

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Gardeners' Notes:


On Jul 13, 2016, coriaceous from ROSLINDALE, MA wrote:

A beautiful plant and a good performer here in Boston Z6a.

H. serrata is about a USDA hardiness zone hardier than the more common H. macrophylla. Its buds and branches are less prone to winter dieback in Z5-7, which means flowering is more consistent.


On Aug 8, 2009, ferngirlpa from Kennett Square,
United States wrote:

I have numerous plants in PA . They are in part-shade and have always bloomed blue and prolifically for me. I have about 7 very large bushes which 4 of them are from taking a large piece of root and just planting in the ground. Give them a mulch in the Spring, and that will help with water. Once established they will bounce back quickly if water is lacking. A beautiful bush that will get quite large if happy.


On Jul 25, 2009, littlelamb from Virginia Beach, VA (Zone 8b) wrote:

My plant gets filtered morning sun and for the rest of the day it's in shade. I love this hydrangea! I've had other hydrangeas but they did not perform as well as this one. It's pretty much carefree with the exception of giving it a drink during a long drought. It seems to do pretty well in heat and humidity provided by the shade it receives.


On Jun 1, 2007, jebjab from Guyton, GA wrote:

I have had this plant for 4 years. The first year it bloomed fine with little effort on my part. The 2nd year it bloomed then was infested with little white flying bugs. The past 2 years the plant has been very healthy, but there has been no flowering. Help.


On May 11, 2006, aprilwillis from Missouri City, TX (Zone 9a) wrote:

I love this plant, it is beautiful. The grower indicates this can be grown in a pot -I am hoping that this works. I have it in virtually complete shade except for some filtered morning sun. I potted this w/ commercial potting soil, acid fertilizer, etc but as someone else noted, it is not quite blue. I have continued to add mild acidifier, but perhaps it really needs a more continuous supply of serious acid fertilier. Either way, this is a beautiful plant!


On Mar 22, 2006, zone5girl from Painesville, OH (Zone 5b) wrote:

It's a pretty plant, but it did not come up blue. The last time I checked, my soil was nearly neutral (slightly acidic). It's in a area that does get some direct sun, but the soil is full of clay so it never dries out. Last year, however, we had record high temps and it wilted until it cooled down, then it would perk back up.


On May 1, 2004, bayouposte from Bossier City, LA (Zone 8a) wrote:

Just bought one and am glad to know about the shade. Was planning to plant in part shade, but may look for a slightly more sheltered location than my original choice since summers here are so hot.


On Jun 14, 2003, aylagirl from High Point, NC wrote:

Very happy with this plant's performance in my Zone 7 garden. It's planted in slightly acidic, clay soil, northwesterly exposure. Shaded by a Bradford pear tree from the hot western sun, otherwise it wouldn't make it through the summer. Does NOT like direct sun! Demands consistently moist soil during first year, to get established. I highly recommend this plant.