General Plant Information (Edit)
Plant Habit: Shrub
Sun Requirements: Full Sun to Partial Shade
Partial or Dappled Shade
Water Preferences: Mesic
Soil pH Preferences: Neutral (6.6 – 7.3)
Plant Height: 3 feet
Plant Spread: 3 feet
Leaves: Deciduous
Other: Turn burgundy in fall
Fruit: Dehiscent
Flowers: Showy
Blooms on old wood
Flower Color: Blue
Other: Will turn dusty pink in less acidic soil
Bloom Size: 3"-4"
5"-6"
Flower Time: Late spring or early summer
Summer
Uses: Cut Flower
Edible Parts: Leaves
Eating Methods: Tea
Propagation: Other methods: Cuttings: Stem
Pollinators: Bees
Child plants: one child plant

Image
Common names
  • Mountain Hydrangea
  • Hydrangea

Photo Gallery
Location: Southern Maine
Date: September 29, 2021
Flowers are now plum and leaves are beginning to show fall color,
Location: Howick Hall gardens, Northumberland, England UK 
Date: 2023-10-09
Hydrangea serrata 'Blue Billow'
Location: Southern Maine
Date: 2018-07-27

Photo courtesy of Singing Tree Gardens Nursery
  • Uploaded by Joy
Location: Southern Maine
Date: 2017-09-19
The blooms are plum to purple to berry shades in the autumn.
Location: Southern Maine
Date: 2018-07-27
Has sky blue to true blue flowers in the summer.
Location: Lucketts, Loudoun County, Virginia
Date: 2018-06-18
Location: Southern Maine
Date: 2019-10-22
The purple and amethyst fall color of Blue Billow is wonderful!

Date: 2011-07-06
Photo Courtesy of Hydrangeas Plus Used with Permission
  • Uploaded by vic
Location: Southern Maine
Date: 2017-09-26
Fall brings shades of burgundy and purple to Blue Billow leaves a

Photo courtesy of Joy Creek Nursery
  • Uploaded by Joy
Location: My Northeastern Indiana Gardens - Zone 5
Date: Sep 28, 2011 1:19 PM
Grown here in alkaline soil. Rosy blooms instead of blue.
Location: My Northeastern Indiana Gardens - Zone 5b
Date: 2011-09-28
Bloom color is dependent on low soil PH. Here, it's grown in alka
Comments:
  • Posted by sedumzz (Fairfax VA - Zone 7a) on May 23, 2021 1:15 PM concerning plant:
    Type: Lacecape
    Bloom: Start out pink and fade to an iridescent blue. Sepals fade to white.

    The leaves are very rough and are deep green. Around 4 feet tall.
  • Posted by goldfinch4 (Ripon, Wisconsin) on Jul 31, 2012 2:52 AM concerning plant:
    Will need winter protection in zone 5 the first year or two, but after that can be quite cold hardy. A tough lacecap that can handle storms and pollution well. An early bloomer. Doesn't tolerate standing water.
  • Posted by Paintedtrillium (Southern Maine - Zone 6a) on Sep 29, 2021 6:34 PM concerning plant:
    I have had Blue Billow for perhaps 25 years. It has been one of the most lovely and reliable plants that I have ever grown. It produced a volunteer seedling which is indistinguishable from the parent. I have since divided and shared that. I couldn't be happier with this plant!
  • Posted by chelle (N.E. Indiana - Zone 5b, and Florida - Zone 9b - Zone 9b) on Nov 10, 2011 9:33 AM concerning plant:
    I garden in alkaline soil. The first year I grew this plant I was fairly dedicated in getting the right amount of PH lowering amendments added to the soil around this plant; so, I had blue flowers. In following years, I forgot more often than not; so a lovely dusky rose is the color of the blooms on my "blue", 'Blue Billow' (];-)

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