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Hortensia ‘Annabelle’ (Hydrangea arborescens)

Deciduous ornamental shrub Hydrangeaceae

Shrubs

Annabelle Smooth Hydrangea – Hydrangea arborescens 'Annabelle'

Hydrangea arborescens 'Annabelle'

Annabelle smooth hydrangea is a very hardy shrub producing enormous creamy white, spherical flower heads in summer. Its rounded habit, dark green foliage and ability to bloom on new wood make it a dependable choice for Canadian gardens.

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Exposure: Full sun to partial shade; moist soil required in sun
Hardiness: Zones 3 to 9

Common nameAnnabelle smooth hydrangea

FamilyHydrangeaceae

GenusHydrangea

Speciesarborescent

CultivarAnnabelle

TypeDeciduous ornamental shrub

Botanical nameHydrangea arborescens 'Annabelle'

Annabelle smooth hydrangea (Hydrangea arborescens 'Annabelle') is an iconic deciduous shrub with a rounded, dense and gently arching habit. In summer, its stems carry impressive spherical white flower heads that may reach approximately 20 to 30 cm across. The blooms emerge soft green, mature to creamy white and gradually return to green as they age. Broadly oval, dark green leaves with lightly toothed edges create a lush background that highlights the flowers. Hardy to Zone 3, this smooth hydrangea blooms on new wood, helping it flower reliably even after harsh Canadian winters. Its abundant display and classic colouring provide strong ornamental interest through summer and into fall.

Annabelle hydrangea grows in full sun or partial shade, although morning light with protection from intense late-afternoon sun is especially suitable. In full sun, the soil must remain consistently moist and watering will need to be more regular. Rich, loose, organically amended and well-drained soil supports its fast growth and oversized blooms. Water deeply during dry periods and apply mulch to conserve soil moisture. Pruning in early spring removes weak, damaged or crossing stems because the shrub flowers on the current season's growth. Moderate pruning generally helps maintain a stronger framework, while cutting every stem extremely low may encourage larger flower heads on softer stems.

In the garden, this white hydrangea suits shaded beds, mixed borders, low informal hedges and foundation plantings near patios or walkways. It creates a dramatic effect when planted in groups with enough spacing for healthy air circulation. Pair it with hostas, ferns, astilbes, coral bells or moisture-tolerant ornamental grasses to build rich contrasts in foliage and texture. The large blooms are excellent for fresh arrangements and dried bouquets, while flower heads left standing add structure during fall and winter. Some pollinating insects may visit the small fertile flowers, although the conspicuous decorative florets are primarily sterile. Plant it where its arching stems have room to display naturally.

Planting guide

From planting to establishment.

Spacing / density Space 1.2 to 1.5 m apart

Best planting time Spring or early fall

Propagation Softwood stem cuttings or division of suckers

Growing method

Plant in a hole approximately twice as wide as the root ball without burying the crown. Loosen the soil, incorporate compost when needed, water thoroughly and add organic mulch. Maintain even moisture throughout the first growing season. Allow enough room for its rounded habit and gently arching stems carrying large flower heads.

Soil and care

The right care,at the right time.

Soil pH

Acidic to neutral, approximately 5.5 to 7

Minimum temperature

Approximately -40°C

Care level

Low to moderate

Watering

Moderate to regular; water deeply during dry periods

Soil type

Rich, moist, loose and well-drained

Fertilization

Compost or balanced shrub fertilizer in spring

Seasonal care

In early spring, remove dead, weak or damaged wood before active growth begins. Since Annabelle hydrangea blooms on new wood, stems may be shortened to renew the shrub, although moderate pruning often preserves a stronger framework. Add compost in spring and refresh the mulch without covering the crown. During summer, monitor moisture carefully, especially in sunny locations, and water deeply whenever the soil begins to dry. Heavy flower heads may bend the stems after rain, so discreet support can be helpful. In fall, leave the dried blooms for winter structure or harvest them for arrangements. Avoid fall pruning so the standing stems and flowers can provide seasonal interest.

Container growing

A garden,within reach.

Recommended pot size

At least 50 to 60 cm wide

Container growing is possible in a large, frost-resistant pot with ample drainage holes. Select a container at least 50 to 60 cm wide and use a rich growing medium that retains moisture without becoming waterlogged. Water frequently during hot weather because containers dry faster than garden soil. Add compost or a balanced fertilizer in spring. In very cold regions, insulate the container, move it to a sheltered location or overwinter it in an unheated cold space to protect the roots. Check moisture occasionally during winter whenever the growing medium is not frozen.

Bloom and dimensions

Its place,in your garden.

Mature height

1.5 m in most gardens

Width / spread

1.8 m in favourable conditions

Flower color

Soft green, then creamy white and pale green

Foliage color

Dark green

Foliage type

Deciduous

Growth rate

Fast

Growth habit

Rounded, bushy

Bloom period

Summer, generally from June to September

Fruiting

Small, inconspicuous dry capsules

Garden associations

In goodcompany.

Companion plants

Hostas, ferns, astilbes, coral bells and moisture-tolerant grasses

Plants to avoid

Plants requiring dry soil or intense heat

Frequently asked questions

Your questions,answered.

When should Annabelle hydrangea be pruned?

Prune it in early spring before new growth begins. Since Hydrangea arborescens 'Annabelle' blooms on new wood, spring pruning does not remove flower buds formed the previous year. Remove dead or weak stems first, then shorten the remaining stems moderately to encourage a strong framework.

Can Annabelle hydrangea grow in full sun?

It can grow in full sun when the soil stays moist and watering is consistent. In Canadian gardens, morning sun or partial shade reduces water stress and wilting. Avoid extremely hot, dry locations exposed to intense late-afternoon sunlight, especially where irrigation is limited.

Why do Annabelle hydrangea stems bend?

The oversized flower heads become heavy after rain and may bend the naturally flexible stems. Moderate spring pruning, rather than cutting every stem extremely low, helps preserve a sturdier framework. A wind-sheltered location, neighbouring plants or discreet supports can also help hold the blooms upright.

How far apart should Annabelle hydrangeas be planted?

Allow approximately 1.2 to 1.5 m between plants so their rounded habit can develop with healthy air circulation. For a denser informal hedge, spacing may be reduced slightly, although the branches will intermingle more as the shrubs mature.

Is Annabelle hydrangea safe for pets?

No. Hydrangea plant parts are not considered safe for dogs, cats or other pets to ingest. Place the shrub beyond the reach of animals that chew plants, and contact a veterinarian or animal poison service promptly whenever ingestion is suspected.

Wildlife and pets

Life,around your plants.

Supporting wildlife

Yes