Bigleaf Hydrangea, French Hydrangea, Mophead 'David Ramsey'

Hydrangea macrophylla

Family: Hydrangeaceae (hy-drain-jee-AY-see-ee) (Info)
Genus: Hydrangea (hy-DRAIN-juh) (Info)
Species: macrophylla (mak-roh-FIL-uh) (Info)
Cultivar: David Ramsey
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36-48 in. (90-120 cm)


36-48 in. (90-120 cm)

4-6 ft. (1.2-1.8 m)


USDA Zone 4a: to -34.4 C (-30 F)

USDA Zone 4b: to -31.6 C (-25 F)

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)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:

Sun to Partial Shade


Parts of plant are poisonous if ingested

Bloom Color:


Medium Blue

Bloom Time:

Late Spring/Early Summer

Mid Summer

Late Summer/Early Fall

Mid Fall



Other details:

Unknown - Tell us

Soil pH requirements:

5.6 to 6.0 (acidic)

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

7.9 to 8.5 (alkaline)

Patent Information:

Unknown - Tell us

Propagation Methods:

From herbaceous stem cuttings

From woody stem cuttings

From softwood cuttings

From semi-hardwood cuttings

From hardwood cuttings

Seed Collecting:

Unknown - Tell us

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Flowers are good for cutting

Flowers are good for drying and preserving

This plant is attractive to bees, butterflies and/or birds

Water Requirements:

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

Where to Grow:

Unknown - Tell us


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

Townsend, Massachusetts

Saylorsburg, Pennsylvania

Wisconsin Dells, Wisconsin

Gardeners' Notes:


On Jun 7, 2015, SpringwoodGrdns from Penn Hills, PA wrote:

Probably not entirely identical to ES Original (Bailmer), because it doesn't bloom/rebloom quite as readily. I have two and they grow to 4 feet in height in a single season, where only at maximum stem height do flowers begin to form (August). During 2014 season it took almost until first Fall frost to get a single bloom!


On Jun 14, 2010, SummerSun06 from Townsend, MA (Zone 5b) wrote:

DNA testing shows 'David Ramsey' to be identical to 'Endless summer'. It is essentially the non-patented version i.e. less expensive. I have both and I can't see a difference. Blooms reliably.