Azalea 'St. Helens'

Mount St. Helens Exbury Azalea

Azalea ‘St. Helens’ is a luminous deciduous azalea from the Northern Lights series, prized for its pure white, lightly fragrant flowers and exceptional cold hardiness. Blooming in mid to late spring, the large, trumpet-shaped blossoms often show a faint yellow throat and stand out beautifully against fresh green foliage. Fall color is burgundy to red, adding late-season interest.

The shrub forms a rounded, upright habit with good density and strong landscape presence. As a deciduous azalea, it tolerates more sun than evergreen types and excels in colder climates.

Key features


Width: 4–6 ft



Height: 4–6 ft



Flower color: Pure white (often with pale yellow throat)



Bloom time: Mid to late spring



Foliage: Green; deciduous with burgundy-red fall color



Form: Rounded, upright shrub



Life cycle: Deciduous shrub



Growing conditions


Sun: Full sun to part shade (best flowering with morning sun)



Soil: Acidic, moist, well-drained; rich in organic matter



Water: Moderate; consistent moisture preferred



Hardiness: USDA Zones 4a–7b



Landscape use


Specimen shrub



Mixed shrub borders



Woodland and naturalized gardens



Cold-climate foundation plantings



Notes


Part of the Northern Lights series, bred for extreme cold tolerance



Lightly fragrant flowers attract pollinators



Mulch to conserve moisture and protect roots



Prune immediately after flowering if shaping is needed

Plant type

Deciduous Shrub, Flowering Shrub

Height

6'

Width

5'

Hardiness zones

3–8

Sunlight

Partial Shade

Growth rate

Moderate

Bloom time

Late Spring

Flower color

Pink

Leaf color

Green

Fall color

Red

Attracts

Butterflies, Hummingbirds

Soil

Loamy, Well Drained

Landscape use

Accent Plant, Container, Mass Planting

Shape

Broad Upright

Bark

Smooth

Fruit

Yes

Deer resistant

Yes

Drought tolerant

No