Cosmos Growing Instructions

Seed sowing instructions

  • Preferred Method

    Direct sowing or start indoors in cell trays

  • Timing

    Direct sowing - After last spring frost

    Indoors - 4 weeks before last spring frost

  • Seed Sowing Instructions

    Direct sowing - Distribute seeds into moist soil and keep evenly moist until germination occurs. Covering with frost cloth until 50% germination can help keep soil moist.

  • Transplant

    After the last spring frost, harden off seedlings over the course of 1 week by gradually introducing them to the elements. Plant out after all danger of frost has passed.

    Buy Seeds Here 
Buy Seeds Here

More information

  • Germination time = 4-6 days
  • Light Requirement = Full Sun
  • Plant Height = Varies
  • Plant Spacing = 6-9 inches
  • Support needed = For tall varieties only