How to Grow Trachelium Plants

Guide to Growing Throatwort and Blue Lace Flower

Although members of the Trachelium genus are perennials, they are usually grown as half hardy annuals in the garden.

Some Trachelium plants can reach from 60 to 90 cm in height (two to three feet), while others have more of a mat like growth.

Trachelium caeruleum
Trachelium caeruleum by yamada*; Creative Commons.

Trachelium plant bloom in the summer, and have blue flowers. Their size makes them ideal for use in rock gardens.

Some common names for Trachelium include Throatwort, and Blue Throatwort.

Trachelium by CGWF; Creative Commons.

How to Grow Throatwort and other Trachelium Plants

Unless you live in very warm areas, it is best to grow throatwort indoors first when growing from seed.

The process should be started in winter about 10 weeks before due to be put outdoors, after the last frost of spring.

Throatwort seeds should be sown on the soil surface. It will take from two to three weeks to germinate at 12 to 16 degrees centigrade (54 to 61°F).

Once ready, transplant the Trachelium plant seedlings outdoors into a shady or partially shady location of the garden. Use a spacing of around 30 cm (1 foot).

The soil that Trachelium plant species grow in should be fertile and have very good drainage. The soil should also be moist, and a touch limey.

Caring for Throatwort and other Trachelium in the Garden

Trachelium Plant species such as Blue throatwort are easy to look after. They like a slightly moist soil so water them when the soil starts to dry out. It is also a good idea to protect them from heavy rain in the winter.

If you require more plants, then they can be propagated in spring by taking cuttings.

Trachelium Growing and Care Guide

Common Names: Blue Throatwort, Blue Lace Flower, Throatwort.
Growing Region: Zones 3 to 10. As a perennial in zones 5 to 10.
Life Cycle: Half hardy perennial commonly grown as a half hardy annual by gardeners.
Native: Mediterranean.
Family: Campanulaceae.
Height: 30 to 40 inches (75 to 100 cm).
Flowers: Summer and/or autumn.
Flower Details: Blue, lilac. Masses. Small flowers. Five petals. Fragrant.
Foliage: Green. Tiny.
Sow Outside: Surface. Mid-Winter in warm areas. Spacing 12 to 24 inches (30 to 60 cm).
Sow Inside: Germination time: two to three weeks. Temperature 60°F (16°C). Two months in advance. Transplant outdoors following the last frost in cool areas, or at the start of autumn or spring in warm areas.
Requirements: Full sunlight or partial shade. Good drainage. Rich soil. Moist soil. Limy soil. Provide support. Water during prolonged dry periods. Propagate: cuttings in the spring.

Common Questions

How many members does the Trachelium genus have?

The Trachelium genus, commonly known as Throatwort, includes about 10 species.

Do members of Trachelium make a good garden or landscaping plant?

Yes, Trachelium species are appreciated for their clusters of tiny, tubular flowers. They make a great addition to borders and mixed perennial gardens.

Which Trachelium species are most frequently grown by gardeners?

The most commonly grown species is Trachelium caeruleum, also known as Blue Throatwort.

Are members of the Trachelium plant genus fragrant?

Trachelium plants are not typically known for fragrance, but their small clustered flowers can be quite attractive.

What is the perfect location to grow Trachelium?

Trachelium thrives in full sun or partial shade with moist, well-drained soil. It's an excellent choice for borders or mixed perennial gardens.

Is Trachelium invasive in the USA, if so in which states?

Presently, Trachelium is not known to be invasive in the USA. Always refer to local regulations for accurate information.

How do I remove Trachelium plants from my garden?

To remove Trachelium, uproot the entire plant including the root system to prevent regrowth.


The Trachelium plant genus belongs to the Campanulaceae family. It comprises around 10-15 species of perennial herbaceous plants, originating from the Mediterranean region and the Canary Islands.

Trachelium prefers full sun or partial shade and thrives in moist, well-drained soil. Seeds can be sown in spring or early autumn. The plant produces clusters of tiny, tubular flowers, creating an attractive domed shape.

I hope that you enjoyed this guide on how to grow Trachelium plants. You may also enjoy the following Gardener's HQ growing guides: How to grow Platycodon and Jasione plants.