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BeddingConservatory GreenhouseHerbaceous PerennialAnnual Biennial

Trachelium caeruleum

blue throatwort

T. caeruleum is an erect perennial to 90cm, usually grown as an annual, with lance-shaped leaves and small, slightly fragrant, violet-blue flowers in domed clusters to 15cm across in summer

Other common names
throatwort
Size
Ultimate height
0.5–1 metres
Time to ultimate height
1–2 years
Ultimate spread
0.1–0.5 metres
Growing conditions
Loam
Sand
Moisture
Moist but well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Blue Green
Autumn Green
Winter
Position
  • Full sun
Aspect

West–facing or East–facing

Exposure
Exposed or Sheltered
Hardiness
H2
Botanical details
Family
Campanulaceae
Native to the UK
No
Foliage
Deciduous
Habit
Bushy
Genus

Trachelium can be cushion-forming or erect perennials with small, simple leaves and tubular flowers with 5 spreading lobes, in summer

Name status

Correct

Plant range
W Mediterranean

How to grow

Cultivation

Grow in moderately fertile, well-drained soil in full sun, ideally with some midday sun. Water freely in dry weather

Propagation

Propagate by seed sown at 16°C in spring

Suggested planting locations and garden types
  • City and courtyard gardens
  • Patio and container plants
  • Cottage and informal garden
  • Flower borders and beds
  • Cut flowers
  • Wall side borders
Pruning

Cut back after flowering

Pests

Generally pest-free

Diseases

Generally disease-free

Get involved

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