Philadelphus 'Starbright'PBR

RHS Plant Profile
mock orange 'Starbright'

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'Starbright' is a compact,upright shrub, to 3m tall, with dark, purplish stems and lanceolate to elliptical, dark green leaves, bronzy purple when young, and pure white, fragrant flowers, to 5.5 cm across, with purplish black calyces

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

2.5-4 metres

Max Spread

1.5-2.5 metres

Size

Time to Maturity
5–10 years
Max Spread
1.5-2.5 metres
Max Height
2.5-4 metres

Growing Conditions

Chalk Clay Loam Sand
Moisture
Moist but well–drained or Well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun Partial shade
Aspect
North–facing or South–facing or East–facing or West–facing
Exposure
Exposed or Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

  • H1A: under glass all year (>15C)
  • H1B: can be grown outside in the summer (10 - 15)
  • H1C: can be grown outside in the summer (5 - 10)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
  • H4: hardy through most of the UK (-10 to -5)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
  • H6: hardy in all of UK and northern Europe (-20 to -15)
  • H7: hardy in the severest European continental climates (< -20)
H6

Colour & Scent

Fragrance Flower
Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Hydrangeaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Columnar upright
Genus
Philadelphus are deciduous shrubs with simple, opposite leaves and bowl-shaped, usually fragrant flowers which may be solitary or in small panicles or racemes in summer
Name Status
Accepted

How to Grow

Cultivation

Grow in a moderately fertile, moist but well-drained to well-drained soil in full sun or partial shade; well suited to a woodland setting

Propagation

Propagate by softwood or hardwood cuttings

Suggested planting locations and garden types

  • Coastal
  • Low Maintenance
  • Flower borders and beds

Pruning

Pruning group 2

Pests

May be susceptible to aphids may be a problem

Diseases

May be susceptible to honey fungus (rarely) and powdery mildews