Mock orange 'Belle Etoile'

Sun

Full sun to partial shade; flowering is best with at least six hours of direct sun.

Water

Moderate; water regularly while establishing, then during prolonged dry spells. Avoid waterlogged ground.

Soil

Well-drained but moisture-retentive soil, including clay improved with organic matter; tolerates acidic, neutral and alkaline conditions.

Height

5-8 ft (1.5-2.4 m)

Spread

4-6 ft (1.2-1.8 m)

Flowers

Late spring to early summer; fragrant white flowers with purple-maroon centres.

Foliage

Opposite, oval, pointed green leaves with toothed edges; autumn colour is usually modest.

Growth

Moderate

Care needed

Low

• Pollinators
• Wildlife
• Low allergen
• Fragrant

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

Difficulty

Easy

Toughness

Very tough

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

1. Planting day

   1.6 ft (0.5 m)

2. After 1 year

   2.6 ft (0.79 m)

3. After 2 years

   4 ft (1.1 m)

4. After 3 years

   4 ft (1.4 m)

5. After 5 years

   6 ft (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

Safe

Growth rate

Moderate

• Water deeply during dry weather for the first two growing seasons.
• Apply a 2-3 in (5-8 cm) mulch of compost or leaf mould in spring, keeping it clear of the stems.
• On poor soil, apply a balanced shrub fertiliser in spring; avoid heavy nitrogen feeding.
• Allow room for the branches to arch naturally rather than repeatedly clipping them.
• Water established shrubs during prolonged drought, particularly while flower buds and blooms are developing.

Pruning. Prune immediately after flowering because next year's flowers develop on older growth. Shorten flowered shoots to strong new growth and remove up to one-third of the oldest stems at ground level; avoid routine winter pruning.

Autumn

Plant while the soil is workable and moist; in very cold climates, plant in spring instead.

Early spring

Remove dead or damaged wood, apply mulch and feed lightly if the soil is poor.

Late spring

Check young shoots for aphids and water if the soil is drying out.

Early summer

After flowering, prune flowered shoots and remove a few of the oldest stems.

Summer

Water during prolonged drought and take softwood cuttings from healthy, non-flowering shoots.

Winter

Check newly planted shrubs for frost heave and avoid trimming healthy stems carrying next season's flower buds.

• Place beside a path or seating area to bring the flower scent close without obstructing access.
• Use in a mixed shrub border with roses and summer-flowering perennials to extend interest after its brief flowering season.
• Plant as a loose, informal hedge where arching branches can develop without regular shearing.
• Set behind hardy geraniums or catmint to soften the bare lower stems.
• Use in a white-flowered border with foxgloves and pale roses.

Garden styles it suits: English country, Cottage garden, Romantic rose garden, Sensory garden, White garden and Traditional.

Plant it with: Shrub roses, Hardy geraniums, Catmint, Foxgloves, Lady's mantle and Clematis.

Wildlife: The open, single flowers can attract bees and other visiting insects. Established branches provide cover for small birds.

• Aphids can cluster on tender shoots; wash them off with water and encourage ladybirds and other natural predators.
• Powdery mildew may affect leaves in dry, crowded conditions; improve airflow and water the root zone during drought.
• Few flowers usually result from pruning at the wrong time, heavy shade or excess nitrogen; prune only after flowering and provide more sun where possible.
• Leaf scorch and early leaf drop can follow drought; water deeply and mulch to keep the root zone cooler and evenly moist.

Philadelphus is not known to be toxic to people, cats, dogs or horses; no part is recognised as seriously poisonous. It is not a food plant, and eating plant material may still cause stomach upset.

• Sweet mock orange (Philadelphus coronarius)

  Usually a larger shrub with pure white flowers lacking the distinctive purple-maroon central blotch of 'Belle Etoile'.

• Mexican orange blossom (Choisya ternata)

  Evergreen, with glossy leaves divided into three leaflets and smaller, star-shaped flowers; 'Belle Etoile' has simple deciduous leaves.

• Japanese mock orange (Pittosporum tobira)

  Evergreen, with thick, leathery leaves clustered near shoot tips and small creamy flowers that age yellow; 'Belle Etoile' has thinner, opposite leaves and much larger flowers.

Mock orange refers to the orange-blossom-like scent of the flowers, while the French cultivar name 'Belle Etoile' means 'beautiful star'.

Propagation. Take softwood cuttings in early summer or hardwood cuttings during dormancy. Layering a low branch also works; seed will not reliably produce plants identical to 'Belle Etoile'.

Accepted botanical name

Philadelphus

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