Pinky Winky hydrangea

Sun

Full sun to partial shade; give it afternoon shade in hot climates. Deep shade reduces flowering.

Water

Keep the root zone evenly moist but not waterlogged. Water deeply during dry spells, especially during its first two growing seasons.

Soil

Moist, well-drained soil enriched with organic matter; tolerates clay if drainage is adequate. Grows in acidic to moderately alkaline soil, and soil pH does not turn its flowers blue.

Height

6-8 ft (1.8-2.4 m)

Spread

6-8 ft (1.8-2.4 m)

Flowers

Mid-summer to autumn; pointed clusters open creamy white, then develop pink to deep rose tones from the base. Colour intensity varies with climate and weather.

Foliage

Oval, pointed, toothed green leaves; autumn colour is usually modest, sometimes yellow.

Growth

Moderate to fast once established.

Care needed

Low

• Pollinators
• Cold hardy
• Low allergen

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Easy

Toughness

Fairly tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   1.6 ft (0.5 m)

2. After 1 year

   3 ft (0.9 m)

3. After 2 years

   4 ft (1.3 m)

4. After 3 years

   6 ft (1.7 m)

5. After 5 years

   7 ft (2.1 m)

   full size

About 4 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Toxic

Growth rate

Fast

• Water deeply when the soil beneath the surface begins to dry; do not rely on brief sprinkling.
• Spread 2-3 in (5-8 cm) of organic mulch over the root zone, keeping it clear of the stems.
• Apply a balanced slow-release shrub fertiliser in spring if growth is weak; avoid heavy nitrogen feeding.
• Allow room for its mature width rather than repeatedly cutting it back to fit a narrow bed.
• In hot, dry locations, protect it from strong afternoon sun and drying winds.

Pruning. In late winter or early spring, remove dead, damaged and crossing stems, then shorten last year's shoots by about one-third if shaping is needed. It flowers on new growth; avoid severe annual cutting, which can produce oversized flower heads on weaker shoots.

Late winter

Remove damaged or crossing stems and lightly shorten shoots before new growth starts.

Spring

Plant while conditions are cool, water thoroughly and mulch the root zone.

Spring

Feed lightly if needed, following the fertiliser label.

Summer

Check soil moisture during dry weather and water deeply before prolonged wilting develops.

Late summer

Enjoy the white-to-pink flower display; cut a few mature heads for indoor drying if wanted.

Autumn

Leave sound flower heads for winter structure, or remove them where heavy snow regularly bends the branches.

• Plant as a specimen in a lawn or broad border where its full outline can develop.
• Repeat along a boundary as an informal flowering hedge, allowing space between plants for their mature spread.
• Place behind catmint, hardy geraniums or coneflowers for contrasting flower shapes and a long seasonal display.
• Combine with ornamental grasses for pink flower heads above fine-textured autumn foliage.
• Use near a terrace or seating area where the changing flower colours and dried winter heads are easy to see.

Garden styles it suits: English country, Cottage garden, Traditional, Modern rustic, Autumn colour and Winter interest.

Plant it with: Catmint, Hardy geranium, Purple coneflower, Feather reed grass, Japanese anemone and Hosta.

Wildlife: The small fertile flowers among the showy sterile florets can attract bees and other insects. It is not a native shrub in the United States, United Kingdom, Canada or Australia, and deer may browse it.

• Wilting or scorched leaf edges: check soil moisture, water deeply and mulch; provide afternoon shade in hot sites.
• Poor flowering: move out of deep shade, avoid excess nitrogen and do not prune after spring shoots have developed.
• Powdery mildew or leaf spots: improve air circulation, water at soil level and clear fallen affected leaves.
• Aphids on young shoots: wash off small colonies with water and encourage natural predators; use insecticidal soap if infestation persists.

Toxic if eaten by cats, dogs, horses or people. All parts contain cyanogenic compounds, with leaves and flower buds a particular concern; ingestion usually causes digestive upset, but large amounts can be more serious. Seek veterinary or medical advice after significant ingestion.

• Limelight hydrangea (Hydrangea paniculata 'Limelight')

  Its flower heads have a conspicuous lime-green stage before becoming cream and later pink; Pinky Winky opens creamy white and often shows a strong pink base beneath a white tip.

• Vanille Fraise hydrangea (Hydrangea paniculata 'Renhy')

  Also changes from white to pink, but usually has fuller, denser flower heads and more arching stems. Pinky Winky generally has more open, sharply pointed panicles on upright stems; check the label when plants are young.

• Annabelle hydrangea (Hydrangea arborescens 'Annabelle')

  Has rounded, ball-shaped white flower heads rather than pointed panicles, and its flowers age greenish or tan rather than developing Pinky Winky's deep pink base.

Hydrangea comes from Greek words meaning water vessel, referring to the seed capsules, while paniculata describes the branched flower clusters.

Propagation. Take softwood cuttings in late spring or early summer, or layer a low branch. Seedlings will not reliably retain the cultivar's characteristics; check local plant breeders' rights before propagating for distribution or sale.

Accepted botanical name

Hydrangea paniculata

In the US and Canada

Introduced in Canada and the lower 48 states.

Native range

China North-Central, China South-Central, China Southeast, Japan, Kuril Is., Sakhalin and Taiwan.

Measured

Average height 580 cm.

Sources: GBIF (CC BY 4.0), USDA PLANTS and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.