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Penny Mac
Bigleaf hydrangea, Mophead
At‑a‑glance
- Group/Class: Bigleaf hydrangea, Mophead
- Height × spread: 4–6 ft (1.2–1.8 m) × 3–5 ft (0.9–1.5 m)
- Bloom window: early summer with repeats into fall
- Color & flower form: pink to blue mopheads
- Fragrance: 0 none
- USDA hardiness: zones 5–9
- Breeder / Year / Origin: Penny McHenry, year unknown, USA
- Awards/registration: Louisiana Super Plant, 2012
- Cut‑flower notes: usable stems; conditioning essential; wilt‑prone if stems dry
- Pet safety: avoid
How it differs
- More likely to rebloom than many older mopheads.
- Stays reliable in Southeast heat and humidity.
- Taller than compact modern selections.
Strengths
- Dependable summer color
- Rebloom potential
- Large, showy heads
Care in one minute
Light: morning sun, afternoon shade.
Soil: rich, well drained; acidify for blue where desired.
Water weekly; mulch 2–3 in (5–8 cm).
Deadhead; prune only dead or weak wood right after bloom.
Watch‑outs
- Late frosts can reduce early bloom in cold zones
- Needs steady moisture
- High pH soils may cause chlorosis
Best uses (tags)
Provenance note
Named for Penny McHenry, founder of the American Hydrangea Society. Introduced to commerce from her garden selections and later trialed by universities.
References
- Missouri Botanical Garden – ‘Penny Mac’
- LSU AgCenter: Penny Mac named Louisiana Super Plant (2012)
- NC State Extension: Hydrangea macrophylla species
- ASPCA: Hydrangea toxicity
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