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Alpine RockeryHerbaceous Perennial

Phlox douglasii 'Crackerjack'

phlox 'Crackerjack'

'Crackerjack' is a compact evergreen perennial to 10cm in height, forming a mat of dark green, awl-shaped leaves and usually solitary, magenta-red flowers 1.5cm across from late spring

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Size
Ultimate height
Up to 10cm
Time to ultimate height
5–10 years
Ultimate spread
0.1–0.5 metres
Growing conditions
Chalk
Loam
Sand
Moisture
Well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Purple Red Green
Summer Purple Red Green
Autumn Green
Winter Green
Position
  • Full sun
  • Partial shade
Aspect

South–facing or East–facing

Exposure
Exposed
Hardiness
H6
Botanical details
Family
Polemoniaceae
Native to GB / Ireland
No
Foliage
Evergreen
Habit
Matforming
Genus

Phlox may be evergreen or herbaceous, mat-forming or erect perennials or shrubs, with simple leaves and salver-shaped flowers in terminal clusters

Name status

Accepted

How to grow

Cultivation

Grow in well-drained, fertile soil in full sun or partial shade

Propagation

Propagate by taking softwood cuttings of non-flowering stems in spring

Suggested planting locations and garden types
  • Gravel garden
  • Patio and container plants
  • Cottage and informal garden
  • Rock garden
  • Garden edging
Pruning

Deadhead to prolong flowering

Pests

Generally pest-free

Diseases

May be susceptible to powdery mildews and a leaf spot

Get involved

The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.