Trachelium caeruleum

Blue throatwort

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Key information

Plant type

Tender perennial

Flower colour



Scented flowers



Skill level


photo by Frederic Didillon, copyright GAP Photos (317074)

Plant details

This tender perennial from the Mediterranean region is usually grown as an annual in the UK. Its beautiful violet-blue or white flowers have help win it the Royal Horticultural Society's prestigious Award of Garden Merit (AGM). They are lightly scented and make good cutflowers. Sow seeds at 13-16C (55-61F) in early spring, then plant out once the danger of frost has passed in early summer. Plants enjoy a sunny spot in well-drained soil and are useful for filing gaps in herbaceous borders.

Family: Campanulaceae

Genus: Trachelium

Species: caeruleum

Plant type: Tender perennial

Flower colour: Violet

Foliage colour: Mid-green

Feature: Scented flowers

Sun exposure: Full sun

Soil: Well-drained/light

Hardiness: Tender

Skill level: Experienced

Height: 120cm

Spread: 30cm

Time to plant seeds: March to April

Time to plant: May to June

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