Hydrangea macrophylla Heart Throb®

(Heart Throb Hydrangea)


Hardiness Zones:

 6a  6b  7a  7b  8a  8b  9a  9b

Quick Overview:

Another bigleaf hydrangea, this one touts a cherry red to wine purple mophead flower depending on the alkalinity or acidity of your soil. It is a hyperaccumulator hydrangea, strangely reactive to the aluminum salts that naturally occur in your soil. It is this, among other minerals, that determine your soil’s pH range. How fun is that? In acidic soil, this lovely petite shrub will produce raspberry red blooms, and in alkaline soil, it will produce a wine red/purple bloom. Blooms start out the reddish color and age to an equally gorgeous and unusual green with red fringe color.

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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. Best to mulch plants year-round with 3″ of shredded bark, peat or compost. Winter hardy to USDA Zone 6.

Additional information

Common Name

Heart Throb Hydrangea

Botanical Name

Hydrangea macrophylla ‘Hortmagitri’


3 gallon

Evergreen or Deciduous


Hardiness Zone

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

Growth Rate


Light Requirements

Part-shade, Part-sun, Shade


3 ft.


3 ft.

Soil Condition


Water Needs

Average, Consistent moisture

Blooming Period


Flower Color

Raspberry pink to purple



Foliage Color


Deer Resistant


Fall Color

variable/not showy

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