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BeddingConservatory GreenhouseHerbaceous PerennialAnnual Biennial
Trachelium caeruleum
blue throatwort
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
![](https://apps.rhs.org.uk/plantselectorimages/detail/WSY0037071_6078.jpg)
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Size
Ultimate height
0.5–1 metresTime to ultimate height
1–2 yearsUltimate spread
0.1–0.5 metresGrowing conditions
Loam
Sand
Moisture
Moist but well–drainedpH
Acid, Alkaline, NeutralColour & scent
Stem | Flower | Foliage | Fruit | |
Spring | Green | |||
---|---|---|---|---|
Summer | Blue | Green | ||
Autumn | Green | |||
Winter |
Position
- Full sun
Aspect
West–facing or East–facing
Exposure
Exposed or Sheltered Hardiness
H2Botanical 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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