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Hydrangea macrophylla

Hydrangea macrophylla (Thunb.) Ser.

 

Blue Hydrangea, Hydrangea, Bigleaf Hydrangea

KingdomPlantaePlants, but not fungi, lichens, or algae (from Stearn’s Botanical Latin)
SubkingdomTracheobiontaVascular plants—plants with a “circulatory system” for delivering water and nutrients
DivisionMagnoliophytaFlowering plants, also known as angiosperms
ClassMagnoliopsidaDicotyledons—plants with two initial seed leaves
SubclassRosidaeRoses, legumes, proteas, dogwoods, hydrangeas, mistletoes, euphorbias, grapes, many more
OrderRosalesRose family and eight others
FamilyHydrangeaceaeHydrangea family
GenusHydrangeaFrom Greek hydro, “water,” and angeion, “vessel”
SpeciesmacrophyllaLarge-leaved

About plant names...

Remember litmus paper? It turns pink in acid and blue in alkaline solutions. So do bigleaf hydrangeas (except that it is the other way around: acid = blue, alkaline = pink). It is a little more complicated, but the principle is the same: there is a pigment in these hydrangeas whose color is determined by the pH of the soil (level of acidity or alkalinity), and by the presence or absence of aluminum. The color is also determined by the amount of pigment that is present in the flowers. If there is no pigment, the flowers are white. If, as with many cultivated varieties, there is a lot of pigment, the shade or pink or blue (or purple) is very intense. Here are some details.

Identification: This hydrangea forms a rounded shrub 3-6' (91-182 cm) around. Branches emerge from the ground and rarely branch. Leaves are opposite, 4-8" (10-20 cm) × 3-6" (7.6-15 cm), crinkly, with serrated leaf margins. Fall color is underwhelming. Flowers form huge, ball-shaped clusters, which may be white or cream-colored; or shades of pink or blue ranging from pale in natural varieties to bright in cultivated varieties. (The samples on this page are cultivars.) The striking flower clusters are popular with landscapers. See this Hydrangea comparison table.

Online References:

Hydrangea macrophylla on FLORIDATA

Hydrangea macrophylla on Plants for a Future, a resource and information centre for edible and otherwise useful plants

Hydrangea macrophylla at the University of Connecticut Plant Database

Hydrangea macrophylla at the Virginia Tech Department of Forest Resources and Environmental Conservation

Hydrangea macrophylla cultivars on Wikimedia Commons

Hydrangea macrophylla (Blue Hydrangea, Hydrangea, Bigleaf Hydrangea)

8/14/2010 · George & Jan’s, Chelmsford, MA
≈ 12 × 8" (31 × 20 cm)

Hydrangea macrophylla (Blue Hydrangea, Hydrangea, Bigleaf Hydrangea)

8/10/2008 ID is uncertain

Hydrangea macrophylla (Blue Hydrangea, Hydrangea, Bigleaf Hydrangea)

8/1/2009 · Gordon & Kathy’s, Prospect, ME
≈ 23 × 19" (59 × 49 cm) ID is uncertain

Hydrangea macrophylla (Blue Hydrangea, Hydrangea, Bigleaf Hydrangea)

8/15/2009 · Naumanns, Chelmsford, MA
≈ 6 × 4" (15 × 10 cm) ID is uncertain

Hydrangea macrophylla description by Thomas H. Kent, last updated 15 Oct 2013.

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Hydrangea macrophylla (Blue Hydrangea, Hydrangea, Bigleaf Hydrangea)

9/27/2013 · Gordon and Kathy’s, Prospect, ME
≈ 12 × 8" (31 × 21 cm)

Hydrangea macrophylla (Blue Hydrangea, Hydrangea, Bigleaf Hydrangea)

Michael Dirr developed these. · 7/2/2010 · Susan and Raimond’s, Phoenix, MD
≈ 21 × 31" (52 × 78 cm)

Hydrangea macrophylla (Blue Hydrangea, Hydrangea, Bigleaf Hydrangea)

Michael Dirr developed these. · 7/2/2010 · Susan and Raimond’s, Phoenix, MD
≈ 31 × 21" (78 × 52 cm)

Hydrangea macrophylla (Blue Hydrangea, Hydrangea, Bigleaf Hydrangea)

8/3/2008 · Kathy’s Flowers
≈ 7 × 4½" (17 × 11 cm) ID is uncertain

Hydrangea macrophylla (Blue Hydrangea, Hydrangea, Bigleaf Hydrangea)

7/29/2007 · Naumanns, Chelmsford, MA
≈ 3 × 2' (94 × 62 cm)

Hydrangea macrophylla (Blue Hydrangea, Hydrangea, Bigleaf Hydrangea)

8/27/2007 · Shore Acres State Park, Cape Arago, OR
≈ 6½ × 4½' (2 × 1.4 m) ID is uncertain

Hydrangea macrophylla (Blue Hydrangea, Hydrangea, Bigleaf Hydrangea)

9/27/2013 · Gordon and Kathy’s, Prospect, ME
≈ 15 × 10" (37 × 25 cm)

Hydrangea macrophylla (Blue Hydrangea, Hydrangea, Bigleaf Hydrangea)

7/12/2009 · MacDonalds, Westford, MA
≈ 18 × 12" (46 × 31 cm)

Range: Zones 6-10:

About this map...