Hydrangea macrophylla ‘Penny Mac’

('Penny Mac' Bigleaf, Hydrangea)

Size Price
1-GALLON $15.99
3-GALLON $32.99

Hardiness Zones:

 5a  5b  6a  6b  7a  7b  8a  8b  9a  9b

Quick Overview:

‘Penny Mac’ is a mophead cultivar that grows 4-6′ tall and as wide. It typically blooms on both old and new wood (produces flower buds not only in fall but also on new growth in spring and summer). Bloom period is typically June to late September. Each inflorescence is a large globose cyme (mophead) that is primarily covered with showy sterile florets which are blue in acidic soils and rose-pink in alkaline soils. Florets tend to change color as they age. Flowers bloom in mid-summer on old growth with rebloom to frost on new growth. Foliage is a bright medium green. ‘Penny Mac’ was first introduced into commerce by Penny McHenry of Atlanta, Georgia (founder of The American Hydrangea Society).



Best grown in rich, medium moisture, well-drained soils in part shade. Tolerates full sun only if grown in consistently moist soils. Soil pH affects the flower color (blue in highly acidic soils and lilac to pink in slightly acidic to alkaline soils). Add aluminum sulfate to the soil to make the flowers bluer or add lime to the soil to make the flowers pinker. Begin soil treatments well in advance of flowering, as in late autumn or early spring. Plants generally need little pruning. If needed, prune immediately after flowering by cutting back flowering stems to a pair of healthy buds. Prune out weak or winter-damaged stems in late winter/early spring. Unlike many other H. macrophylla cultivars, ‘Penny Mac’ (1) blooms on both old and new growth and (2) is winter hardy to USDA Zone 5.   (Courtesy of Missouri Botanical Garden Plant Finder)

Additional information

Common Name

'Penny Mac' Bigleaf, Hydrangea

Botanical Name

Hydrangea macrophylla 'Penny Mac'

Evergreen or Deciduous


Hardiness Zone

5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b

Growth Rate


Light Requirements

Part-shade, Part-sun, Shade


4 to 6'


4 to 6'

Soil Condition


Water Needs


Blooming Period


Flower Color

Blue to Pink



Foliage Color


Deer Resistant


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