Hydrangea macrophylla 'Cardinal Red'

Cardinal Red Bigleaf Hydrangea

Hydrangea macrophylla 'Cardinal Red' — commonly called Cardinal Red bigleaf hydrangea — is a deciduous shrub valued for its rich deep red to reddish-rose mophead blooms, a relatively uncommon color among bigleaf hydrangeas. The rounded flower heads appear in summer above glossy dark green foliage, creating strong contrast and bold color in shaded garden settings. Flower color remains strongest in more neutral to slightly alkaline soils.

Mature Size:
Width: 4–5 ft
Height: 4–5 ft

USDA Zones: 6a–9b

Form: Rounded, dense shrub

Light: Partial shade to morning sun with afternoon shade

Soil / Water: Moist, well-drained, fertile soil; prefers consistent moisture and organic-rich conditions

Features / Wildlife / Landscape Uses:
Deep red blooms provide bold midsummer color in foundation plantings, woodland borders, cottage gardens, and mixed shrub beds. Flowers attract pollinating insects and are useful for fresh or dried arrangements. Dark foliage enhances bloom contrast through the growing season.

Care:
Prune only after flowering if needed, since flower buds form on old wood. Avoid highly acidic soils if maintaining red flower color is desired.

Plant type

Flowering Deciduous Shrub

Height

4-5'

Width

4-5'

Hardiness zones

5–9

Sunlight

Full Sun, Partial Shade

Growth rate

Moderate

Bloom time

Early Fall, Early Summer, Late Summer, Summer

Flower color

Red

Leaf color

Green

Fall color

Green

Attracts

Bees, Butterflies, Hummingbirds

Soil

Moist well-drained, Rich

Landscape use

Accent Plant, Container, Foundation Plant, Mass Planting

Shape

Dense, Rounded

Bark

Smooth

Fruit

Yes

Drought tolerant

No