Bigleaf Hydrangea, French Hydrangea, Mophead 'Mme Emile Mouillere'

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: Mme Emile Mouillere
Additional cultivar information:(aka Sedgewick's White)
» View all varieties of Hydrangeas


36-48 in. (90-120 cm)

4-6 ft. (1.2-1.8 m)


4-6 ft. (1.2-1.8 m)


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:

White/Near White

Bloom Time:

Mid Summer

Late Summer/Early Fall



Provides winter interest

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)

Patent Information:


Propagation Methods:

From herbaceous stem cuttings

From softwood cuttings

From semi-hardwood cuttings

By simple layering

Seed Collecting:

N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Flowers are good for drying and preserving

Water Requirements:

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

Where to Grow:

Suitable for growing in containers


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


Los Altos, California

Loganville, Georgia

Norcross, Georgia

Nacogdoches, Texas

Olympia, Washington

show all

Gardeners' Notes:


On May 30, 2016, wendymadre from Petersburg, VA wrote:

I have had Mme. Emile Mouillere in my yard for over a year in my Zone 7A garden, in Petersburg, VA. It was in a one gallon pot when I bought it and now is in a three gallon pot, while I figure out where to fit it in. The information here on this site doesn't give it credit for the 6-1/2 foot spread, or even 2-1/2 meters that other sources give. Anyway, it is supposed to be suitable for containers, and in this year, it has tripled in size and is beginning to bloom. It has been out in a shady spot, with some partial sun exposure. The UK source says sun/part shade, but I don't know how it would handle afternoon sun here in southern Virginia. The blooms are supposed to be particularly good, among hydrangeas, for vases and drying.


On Jun 9, 2015, SpringwoodGrdns from Penn Hills, PA wrote:

This is moderately hardy in zone 6, producing some blooms. It can bloom on new wood at times, but is shy to do so. Purportedly one of the more sun-tolerant of the white macrophyllas. The foliage is an attractive emerald green, with long leaf internodes. The flowers are pH sensitive, where they will start white and acquire either a pink or blue hue as they mature.


On Dec 2, 2004, lmelling from Ithaca, NY (Zone 5b) wrote:

According to the authors of "Encyclopedia of Hydrangeas" C.J. and D.M. Van Gelderen (2004 - Timber Press), "A vigorous growing shrub up to 6.5' high and wide. Branches are weak, so plants are often untidy. Flowerheads are numerous, of medium size, with sepals packed together, pure white, serrrate, fading to light pink, and long lasting. Flowering occurs in June. This may be the best known white cultivar.

Other information: cold resistant; foliage turns red, orange and green in autumn.