200 BOTTLE GENTIAN (Closed or Blind Gentian / Cloistered Heart) Gentiana Andrewsii Flower Seeds BLOOM TIME: Aug - Oct HARDINESS ZONE: 3 - 6 PLANT HEIGHT: 12 - 24" . . . PLANT SPACING: 9 - 12" LIGHT REQUIREMENTS: Sun - Part Shade . . . SOIL / WATER: Average The Bottle gentian has clusters of bottle shaped flowers that never open.