Little Lime hydrangea

Sun

Full sun to partial shade; give 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 in the first two growing seasons and when grown in a container.

Soil

Moist, well-drained soil enriched with organic matter; tolerates clay if drainage is adequate. Soil pH does not turn the flowers blue or pink.

Height

3-5 ft (0.9-1.5 m)

Spread

3-5 ft (0.9-1.5 m)

Flowers

Summer into autumn; lime-green flower heads become creamy white, then develop pink tones as they age. Colour development varies with temperature and growing conditions.

Foliage

Medium-green, oval leaves with toothed edges; autumn colour is usually modest, sometimes yellow.

Growth

Moderate; usually reaches its mature outline within several growing seasons.

Care needed

Low

• Cold hardy
• Wildlife
• 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

   2.1 ft (0.64 m)

3. After 2 years

   2.6 ft (0.78 m)

4. After 3 years

   3 ft (0.92 m)

5. After 5 years

   4 ft (1.2 m)

   full size

About 5 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

Moderate

• Water slowly at the base when the soil begins to dry; do not let newly planted roots dry out.
• Apply a 2-3 in (5-8 cm) layer of organic mulch, keeping it clear of the stems.
• Feed lightly in spring if growth is weak or soil is poor; avoid heavy nitrogen feeding.
• Use a large container with drainage holes, and check its moisture more often than garden soil.
• Allow room for the mature spread so stems do not crowd neighbouring plants.

Pruning. Prune in late winter or early spring before strong new growth begins, removing dead, damaged and crossing stems. Shorten last year's shoots by up to about one-third to maintain a compact framework; routine hard cutting to the ground is unnecessary.

Late winter

Remove old flower heads and prune before strong new growth begins.

Spring

Plant when the ground is workable, water thoroughly and mulch the root zone.

Mid-spring

Feed lightly if needed and check that mulch is not touching the stems.

Summer

Water deeply during dry weather, particularly while flower heads are developing.

Autumn

Plant in mild regions while soil remains warm; leave fading flower heads for seasonal structure if desired.

Late autumn

In cold regions, protect container roots by moving the pot to a sheltered position or insulating it.

• Plant in groups along the middle of a mixed border for a continuous band of late-season flowers.
• Use as a low, informal flowering hedge beside a path, allowing room for its full width.
• Grow in a large patio container as a seasonal focal point.
• Combine with ornamental grasses and autumn-flowering perennials for contrasting textures.
• Place against dark evergreen shrubs to make the pale flower heads stand out.

Garden styles it suits: Cottage garden, English country, Modern, Small-space, White garden and Autumn colour.

Plant it with: Japanese forest grass, Coral bells, Hardy geraniums, Hostas, Feather reed grass and Autumn asters.

Wildlife: The showy flower heads contain many sterile florets, so this is not a strong choice for nectar or pollen compared with more fertile-flowered shrubs. Its branching provides some shelter for small garden wildlife.

• Wilting or scorched leaf edges: check soil moisture and water deeply; provide afternoon shade in hot sites rather than repeatedly wetting the foliage.
• Yellowing leaves and declining growth in wet soil: improve drainage or relocate the shrub; do not keep watering saturated ground.
• Leaf spots or powdery mildew: improve airflow, water at soil level and clear fallen diseased leaves.
• Flower stems bending after rain: avoid excessive nitrogen and severe annual pruning; retain a sturdy branching framework.

Leaves, flower buds and other plant parts contain cyanogenic compounds and are toxic if eaten by cats, dogs, horses or people. Ingestion most often causes vomiting, diarrhoea or abdominal discomfort; large amounts can cause more serious poisoning. Seek veterinary or medical advice after ingestion.

• Limelight hydrangea (Hydrangea paniculata 'Limelight')

  Has similar lime-green flower heads but usually grows much larger, around 6-8 ft (1.8-2.4 m) tall and wide; young plants can be difficult to distinguish without labels.

• Bobo hydrangea (Hydrangea paniculata 'Ilvobo')

  Usually stays smaller, around 2.5-3 ft (0.75-0.9 m) tall, and carries dense flower heads that open white rather than showing Little Lime's pronounced lime-green opening colour.

• Annabelle hydrangea (Hydrangea arborescens 'Annabelle')

  Has rounded, ball-shaped white flower heads rather than pointed panicles, with broader leaves and stems that often flop under the flowers.

Hydrangea comes from Greek words meaning water vessel, referring to the seed capsules, while paniculata describes the branched flower clusters and Little Lime refers to the compact habit and lime-green flowers.

Propagation. Softwood cuttings taken in late spring or early summer can produce plants true to the cultivar; seed will not. Little Lime is a protected commercial cultivar in some countries, so check current local propagation rights before taking cuttings.

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.