PlantFiles is getting a new look! Just in time for spring, we're rolling out a new look for the best online plants database. It will also work with your smart phones and mobile devices, so now you can take it with you on garden center visits or botanical garden tours. Questions or comments? Please post them here.

Blue Lace Flower, Rottnest Island Daisy
Trachymene coerulea

Family: Apiaceae (ay-pee-AY-see-ee) (Info)
Genus: Trachymene (tray-ki-MEE-nee) (Info)
Species: coerulea (ko-er-OO-lee-uh) (Info)
Synonym:Didiscus caeruleus
Synonym:Didiscus coeruleus
Synonym:Trachymene caerulea




12-18 in. (30-45 cm)


9-12 in. (22-30 cm)


Not Applicable

Sun Exposure:

Sun to Partial Shade


Unknown - Tell us

Bloom Color:


Bloom Time:

Blooms repeatedly



Other details:

Average Water Needs; Water regularly; do not overwater

Self-sows freely; deadhead if you do not want volunteer seedlings next season

Soil pH requirements:

Unknown - Tell us

Patent Information:

Unknown - Tell us

Propagation Methods:

From seed; direct sow outdoors in fall

From seed; sow indoors before last frost

Seed Collecting:

Collect seedhead/pod when flowers fade; allow to dry

Properly cleaned, seed can be successfully stored


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

Barbourville, Kentucky

Ewing, Kentucky

Louisville, Kentucky

Omaha, Nebraska

Berea, Ohio

Memphis, Tennessee

Kalama, Washington

show all

Gardeners' Notes:


On Nov 2, 2006, sheezaladybug from Memphis, TN (Zone 7b) wrote:

I grow a cut flower crop, and trachymene does great here in Memphis (7b) in the spring. Last year, I planted it out in early March and had cuts through June. I'm trying it in the greenhouse as a winter crop, but can't find any solid culture information.


On May 2, 2002, nuthouse wrote:

In a 6a garden the didiscus self seeds. I have found over the last three years that they will continually rebloom if spent blooms are removed regularly. The small plants are easily moved in spring when they have 4 to 6 leaves. They are happier in more sun than shade.


On Aug 10, 2001, eyesoftexas from Toadsuck, TX (Zone 7a) wrote:

This is one of the most delicate and pretty of all half-hardy annuals. The delicate flowers are a blue version of the wildflower, Queen Anne's Lace. It forms a bushy plant with light green, deeply divided foilage. The small, dainty lavender-blue flowers are displayed in heads 1-2 inches wide and appear from midsummer to autumn. They are suitable for cutting, but the leaves and stems are sticky to touch.

Cultivation: Ordinary, well cultivated garden soil and a sunny, sheltered position suit it.

Propagation: Late winter or early spring, sow seeds in 1/8" deep flats of sterile potting soil at 61`F. When seedlings are large enough to handle, separate into pots. Plant out as soon as all danger of frost is past.