General Plant Information (Edit)
Plant Habit: Shrub
Life cycle: Perennial
Sun Requirements: Full Sun to Partial Shade
Partial or Dappled Shade
Water Preferences: Mesic
Soil pH Preferences: Strongly acid (5.1 – 5.5)
Moderately acid (5.6 – 6.0)
Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Minimum cold hardiness: Zone 4a -34.4 °C (-30 °F) to -31.7 °C (-25 °F)
Maximum recommended zone: Zone 9b
Plant Height: 3 - 5 feet
Plant Spread: 3 - 5 feet
Leaves: Good fall color
Fruit: Other: none, is sterile
Flowers: Showy
Blooms on old wood
Blooms on new wood
Other: Repeat bloom on new wood
Flower Color: Blue
Other: Color depends on soil PH.
Bloom Size: 5"-6"
Flower Time: Late spring or early summer
Late summer or early fall
Uses: Windbreak or Hedge
Cut Flower
Dried Flower
Propagation: Other methods: Cuttings: Stem
Cuttings: Cane
Pollinators: Other: None
Containers: Suitable in 3 gallon or larger
Needs excellent drainage in pots
Miscellaneous: Patent/Plant Breeders' Rights: PP15,298 (2004)
Child plants: 7 child plants

Trade name information:
Series: Endless Summer®
Trade Name: The Original
Cultivar name: 'Bailmer'
Common names
  • Bigleaf Hydrangea
  • French Hydrangea
  • Mophead
  • Hydrangea

Photo Gallery
Location: New York, NY
Date: 2015-06
Bronx Botanical Garden

Date: 2015-11-06
Uploaded by Lucichar
Location: In my garden, Cottage-in-the-Meadow Gardens, South Amana, IA
Date: Late spring 2010
Location: Maine
Date: 2015-08-04
Location: Maine
Location: My father's garden, Vichte, Belgium
Location: San Antonio, TX
Date: May 20, 2012
Bigleaf Hydrangea
Location: My garden, central NJ, Zone 7A
Date: 9/22/14
Hydrangea Endless Summer on the last day of summer, 2014
Location: My garden, central NJ, Zone 7A
Date: 2018/07/03
Amazing, Fully Packed Flower
Location: Gulf Coast
Date: 2019-06-25
Blooms are deep blue in my acid soil. I added small bits of metal
Location: East Garden 
Date: 2022-06-11
various stages of blooms
Location: Eagle Bay, New York
Date: 2007-06-24
Bigleaf Hydrangea (Hydrangea macrophylla Endless Summer®

Date: 06-03-2022
Location: my garden 
Date: 2015-05-04
Location: Cary, North Carolina private garden
Date: 2023-05-13
Got this 10 years ago when they were first introduced, always a s
Location: West shade garden
Date: August
Location: New Hampshire
Date: July
credit: Captain-tucker
Location: Fairfax, Virginia (Outdoors)
Location: Kalama, wa
  • Uploaded by Joy
Location: In my garden, Cottage-in-the-Meadow Gardens, South Amana, IA
Date: 2008-07-22

Date: 2013-09-19
Location: Louisa, va
Pink blooms now. I added spagnum peat moss to the soil, so hoping

Date: 2019-06-25
Location: My zone 3a garden
Date: 2014-08-27
Location: Downingtown, Pennsylvania
Date: 2019-07-05
still young about 3 years after planting from pot
Location: Clinton, Michigan 49236
Date: 2016-06-30
"Hydrangea macrophylla, 2016, bigleaf [Hydrangea], hye-DRAIN-juh
Location: 382 River Road, Pequea, PA 17565
Date: June 18, 2015
Hydrangea macrophylla Endless Summer The Original
Location: KALAMA WA
  • Uploaded by Joy
Location: North Eastern Pennsylvania
Date: 2011-10-05
Location: Cleveland Ohio
Date: June 29 2012
Location: My yard, Zone 6
Location: Bloomington, IL
Date: 2012-06-16
Fully open bloom.
Location: My garden, Pequea, PA 17565
Date: 2016-06-24
Location: My garden, Pequea, Pennsylvania 17565
Date: 2017-06-22
Good year for hydrangeas after several years recovering from two
Location: Maryland
Date: 2015-06-08
Location: In my Mom's garden
Date: 2011-06-08

Date: 2012-05-13
Location: Zone 4 Wisconsin
Date: 2008-07-09
7-9-08 zone 4 Wisconsin
Location: Philadelphia 
Date: 2021-06-28
Location: Washington Park Botanical Garden, Springfield, Il.
Date: 2019-07-24
Location: At a nursery
Date: 2008-05-31
Location: My yard, Zone 6
Date: 2013-08-04
Location: Orlando Florida
Date: 2011-05-28
Hydrangea macrophylla Endless Summer

Date: 2013-09-19
Location: My garden, Pequea, Pennsylvania 17565
Date: 2017-06-14
Location: Cincinnati, Ohio
Date: June 2008
This Hydrangea Endless Summer was easily propagated by layering o
Location: Cincinnati, Ohio
Date: June 2010
Endless Summer, pink blossoms in alkaline soil.
Location: Clinton, Michigan 49236
Date: 2016-06-30
"Hydrangea macrophylla, 2016, bigleaf [Hydrangea], hye-DRAIN-juh
Location: Clinton, Michigan 49236
Date: 2017-06-28
"Hydrangea macrophylla, 2017, [Bigleaf Hydrangea], hye-DRAIN-juh
Location: Fairfax, VA | June, 2022
Location: Kalama, Wa
Date: 2011-07-25
  • Uploaded by Joy

fertile bloom
Location: NW Wisconsin 
Date: 2015-09-26

Date: 2015-06-11

Date: 2015-06-11
Location: At a nursery
Date: 2008-05-31
Location: My yard, Zone 6
Date: 2010-06-19
Location: My yard, Zone 6
Location: Carbon Hill, AL 
Date: 2016-06-14
Location: Bloomington, Illinois
Date: 2012-06-16
As they open, the hearts remain white, as the petals become incre
Location: Des Plaines, IL
Date: 6/19/12

Date: 2013-09-19
Location: Bloomington, Illinois
Date: 2012-06-16
Partially opened bloom.  Still largely white, with blue edges.

Date: 2013-09-19

Date: 2013-09-19
Location: Wisconsin
Date: 2011-07-12
Zone 4 Wisconsin
Location: Bloomington, Illinois
Date: 2012-06-16
Buds before they begin opening.  They appear greenish-yellow.
Location: My zone 3a garden
Date: 2014-08-26
Location: Cincinnati, Ohio
Date: June 2008
Enjoy Endless Summer's big mopheads in the house

Date: 2014-05-12
Location: Virginia
Date: 2011-05-27
Third round of flowers

Date: 2015-06-10
Location: Silver Spring, MD
Date: 2014-07-04

Date: 2015-06-10

Date: 2015-06-10
Location: my garden 
Date: 2015-05-04
Location: Des Plaines, IL
Location: Maryland
Date: 2015-07-03
Location: my garden; 5/27/15 Kroger
Date: 2015-05-27
Location: My garden in Kalama, Wa. Zone 8
Date: 2012-06-17
  • Uploaded by Joy

Date: 2015-06-11
This plant is tagged in:
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  • Posted by Ispahan (Chicago - Zone 6a) on Jul 4, 2012 7:34 PM concerning plant:
    This is one of the most over planted and unattractive plants in my area. Attractive specimens do exist, but they are few and far between. It usually looks rangy, weedy and the blooms are of a muddy, washed out color whether pink or blue. I have three established specimens that I am itching to take out and replace with another hydrangea that is more attractive and reliable, such as 'Annabelle' or 'Little Lime'. A truly inferior cultivar!
  • Posted by goldfinch4 (Ripon, Wisconsin) on Jul 9, 2012 12:33 PM concerning plant:
    My 'Endless Summer' is a flower machine, blooming almost nonstop from early summer until frost. With the ph of my soil I get pink, lavender and blue flowers at the same time - it's beautiful! The flowers also dry nice and make for great fall arrangements.
  • Posted by kqcrna (Valencia, Pa - Zone 6a) on Oct 23, 2011 5:36 AM concerning plant:
    My Endless Summer hydrangeas bloom heavily in early summer, and sporadically through summer they produce occasional flowers. Hydrangea blossom color is blue in acidic soil, pink in alkaline soil, so you can change the color by amending your soil appropriately. They can easily be propagated by layering.
  • Posted by sherrilosee (Bloomington, IN - Zone 6a) on Sep 9, 2012 7:42 PM concerning plant:
    The blooms age beautifully!
  • Posted by frankrichards16 (Clinton, Michigan - Zone 5b) on Mar 2, 2018 7:14 AM concerning plant:
    Found in a St. Paul garden (~1996) by Vernon Glen Black (an employee of Bailey Nurseries). Patented by Bailey Nurseries as Hydrangea macrophylla 'Bailmer' and marketed as Endless Summer® (PP15298, 2004). Eventually, this trademark grew into a series, so 'Bailmer' is now commonly called Endless Summer® The Original. It had the unique ability to dependably bloom on both old and new growth as far north as Zone 4. Michael A. Dirr from the University of Georgia developed three additional cultivars for the series.
  • Posted by Catmint20906 (PNW WA half hour south of Olympia - Zone 8a) on Aug 23, 2014 7:02 PM concerning plant:
    Hydrangea macrophylla Endless Summer® The Original was my first hydrangea, and several hydrangeas later it is still my favorite. It produces a bountiful supply of large blossom globes from early summer to fall. Each blossom retains its color quite well for an extended period of time. Moreover, because Endless Summer blooms on both old and new growth, it will bloom even following harsh winters that cause the shrub to die to the ground.
  • Posted by ILPARW (southeast Pennsylvania - Zone 6b) on Jul 6, 2019 1:48 PM concerning plant:
    The mother species of this Bigleaf Hydrangea came from Japan. This cultivar with the large, hortensia (mophead) flower clusters has been replacing the old, very popular cultivar of 'Nikko Blue' because this new one can bloom on new wood and can be pruned at various times to rebloom the next year while the older cultivar can only bloom on old wood and be pruned right when the flowers lose their colour, otherwise won't bloom the next year. If the Bigleaf Hydrangea is not pruned sometimes, it becomes large and messy with dead stout stems among it. Either cultivar or any other similar cultivars are known as "the Hydrangea" in the Philadelphia, PA, region as it is so very abundantly planted there and around the Mid-Atlantic, offered from conventional nurseries to big box stores. Magically, this 'Endless Summer' is hardy to Zone 4, while the vast majority of this species cultivars were and are cold hardy only to Zone 6. Growing up in the 1950's onward, west of Chicago, IL, in Zone 5a, I only saw such a plant as a florist flowering plant, just like the Japanese Evergreen Azaleas. The hortensia or mophead flower cluster is a mutation that is composed of all the sterile showy florets that normally only ring the outside of the cluster; not having any of the tiny fertile florets that normally make up the rest of the inflorescence. Thus, it offers no pollen or nectar for pollinators. I much prefer the natural lacecap forms of any hydrangeas because their flat flower clusters, having both fertile and infertile florets, do supply pollinators and the flower clusters are not so heavy that they fall down. The flowers are blue in colour from the use of aluminium ions from acid soils from pH 5.0 to about pH 6.0; then they can be purple at a little higher pH, and then pink above pH of 6.5. The 'Endless Summer' Hydrangeas are mostly pink in the Chicago and upper Midwest due to most soils being around pH of 7.0.
Plant Events from our members
Catmint20906 On May 27, 2015 Bloomed
piksihk On August 28, 2015 Plant Ended (Removed, Died, Discarded, etc)
piksihk On May 27, 2015 Obtained plant
Bunilla On June 2, 2016 Obtained plant
NikkiGerena On June 12, 2017 Transplanted
DeweyRooter On February 2, 2023 Transplanted
Planted on north side of house next to Stephanie Golden camellia
DeweyRooter On November 4, 2022 Obtained plant
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