Cosmidium - Brunette (Cosmidium Burridgeanum Brunette) Burridge's Greenthread Heirloom Flower

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Cosmidium - Brunette (Cosmidium Burridgeanum Brunette) Burridge's Greenthread Heirloom Flower

Annual

Height 18 to 24 in

Cosmidium resembles a coreopsis; this variety is a prolific bloomer and makes an  excellent choice for borders and for use as cut flowers. Cosmidium burridgeanum is also known as Burridge's Greenthread and Thelesperma burridgeanum. A care-free favorite since the 19th century, Brunette cosmidium produces strikingly colorful flowers ringed in golden yellows with contrasting reddish chocolate colored centers, and has airy, fern-like foliage. Blooms from June until October.

  • Full sun
  • Well draining soil
  • Direct sow in early spring under cover into prepared seedbeds with moistened fine soil. Rake seed in. Press into soil by walking over the area. Keep moist until germination.
  • OR start seeds indoors 4 to 6 weeks prior to last frost date. Sow on moist fine soil and lightly cover with vermiculite. Plant out after all risk of frost has passed.
  • Germination in 7 to 14 days at 15-20 C (59-68 F). Do not exclude light during germination.
  • Spacing: 18 in apart
  • Deadhead to encourage continuous blooming
  • Harvest seeds when blooms have expired and dried 
  • Seed Count: 25