Cosmidium Seeds - Cosmidium Burridgeanum Brunette Greenthread Flower Seeds

Cosmidium Seeds - Brunette

Flower Specifications

Season: Annual

USDA Zones: 3 - 10

Height: 20 inches

Bloom Season: Mid summer to early fall

Bloom Color: Mahogany with yellow edge

Environment: Full sun

Soil Type: Well drained soil, pH 6.0 - 7.5

Deer Resistant: Yes

House Plant: No

Latin Name: Cosmidium Burridgeanum

Planting Directions

Temperature: 60 - 68F

Average Germ Time: 10 - 14 days

Light Required: Yes

Depth: Barely cover the seeds with sifted soil

Sowing Rate: 2 - 3 seeds per plant

Moisture: Keep soil moderately moist during germination

Plant Spacing: 18 inches

Care & Maintenance: Cosmidium

Cosmidium (Cosmidium Burridgeanum Brunette) - Grow these lovely annuals from Cosmidium seeds. These showy flowers are simple and fast to grow. The Cosmidium plant reaches 20 inches tall and produces masses of blooms with distinctive reddish chocolate centers with tips of gold and finely cut foliage.

Excellent cut flower

Cosmidium resembles a coreopsis and is a prolific bloomer. They are excellent both for the border or for use as a cut flower. Cosmidium burridgeanum is also known as Burridge's Greenthread and Thelesperma burridgeanum.

brunette cosmidium flowers

Cosmidium seed | brunette

How to grow

How To Grow Cosmidium From Seed: Grow Cosmidium in a sunny setting. Deadhead spent blooms to prolong flowering and encourage continuous blooming. Leave a few plants to die down and self seed. Do not over fertilize as it will cause a decreased number of blooms.

Sow Cosmidium flower seed directly outdoors after frost season has passed. Prepare a seedbed, soil should be fine and weed free. Sow Cosmidium seeds in rows 18 inches apart, 6 seeds per foot. Keep soil moist. Thin seedlings to strongest plant, 18 inches apart. Carefully replant the thinned seedlings.

  • Sowing Rate: 2 - 3 seeds per plant
  • Average Germ Time: 10 - 14 days
  • Keep moist until germination
  • Attracts butterflies
  • Depth: Barely cover the seeds with sifted soil
cosmidium seeds brunette

Flower Specifications

For best results, provide a well-drained soil in full sun. When large enough to handle, transplant seedlings into 3 inch pots or trays. Gradually acclimatise young plants to outdoor conditions for 10 - 15 days before planting out after all risk of frost, 9 - 12 inches apart.

  • Height: 20 inches
  • USDA Zones: 3 - 10
  • Season: Annual