Photo by Melody

PlantFiles: Blue Throatwort
Trachelium caeruleum

Family: Campanulaceae (kam-pan-yew-LAY-see-ee) (Info)
Genus: Trachelium (trak-ELL-ee-um) (Info)
Species: caeruleum (see-ROO-lee-um) (Info)

2 vendors have this plant for sale.

10 members have or want this plant for trade.


36-48 in. (90-120 cm)

36-48 in. (90-120 cm)

USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)
USDA Zone 10a: to -1.1 C (30 F)
USDA Zone 10b: to 1.7 C (35 F)
USDA Zone 11: above 4.5 C (40 F)

Sun Exposure:
Full Sun
Sun to Partial Shade

Handling plant may cause skin irritation or allergic reaction

Bloom Color:

Bloom Time:
Mid Summer
Late Summer/Early Fall


Other details:
This plant is attractive to bees, butterflies and/or birds
Drought-tolerant; suitable for xeriscaping

Soil pH requirements:
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
7.9 to 8.5 (alkaline)

Patent Information:
Unknown - Tell us

Propagation Methods:
From softwood cuttings
From seed; sow indoors before last frost
From seed; direct sow after last frost

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds
Properly cleaned, seed can be successfully stored

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3 positives
No neutrals
No negatives

Gardeners' Notes:

Positive kaydiehl On Apr 26, 2011, kaydiehl from Pasadena, CA wrote:

Looks lovely in among the roses. Blue softens the contrast among bright roses that might otherwise clash. Gets tall enough to need support. I grow them through short hoops about a foot tall so I don't have to stake each individual cane. Once the roses are up and the tracheliums are well sprouted, the supports are invisible.

Positive gardenbeads On May 16, 2006, gardenbeads from Warren, MI (Zone 5a) wrote:

This plant is commonly called Blue Lace flower or Blue Throatwart. It is a tender perennial and does not overwinter in Michigan but can be grown as an annual. It will grow to about 2 1/2 feet high and has a bush-like habit. It flowers continuously from summer to fall and does best in sun/part shade. A great cut flower, one of my favorites.

Positive jkom51 On Nov 22, 2002, jkom51 from Oakland, CA (Zone 9b) wrote:

Beautiful flower heads on slender stems; plant needs some staking when it gets to full 3' height. Flowerheads are fragrant, very similar to lilac with a vanilla scent. Excellent as cut flowers.


This plant has been said to grow in the following regions:

Clovis, California
Davis, California
Fairview, California
Fremont, California
La Canada Flintridge, California
Martinez, California
Norwalk, California
Oakland, California
Pasadena, California
Perris, California
Richmond, California
Sacramento, California
San Mateo, California
Santa Clara, California
Soquel, California
Warren, Michigan
Saint Joseph, Missouri
Austin, Texas (2 reports)
Vancouver, Washington

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