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Growing Cosmos – Easy Annuals

Growing Cosmos – Easy Annuals

Cosmos

Cosmos! What a stonking name for a plant evoking all the constellations in the Universe.

Growing Cosmos

  • Cosmos flowers are a ring of broad petals and a center of disc florets similar to a daisy.
  • Cosmos flowers are 2-4 inches in diameter.
  • There is a lot of color variation including white, pink, orange, yellow, chocolate and scarlet colors.
  • Most Cosmos bloom heavily but die with first frost.
  • Leaves are fine and delicate and therefore the plants do not over shadow other flowers.
  • Cosmos get quite tall at up to four feet but in rich, fertile soils tend to produce unusually tall, lanky plants.

Cosmos

More Growing Tips from Seed

  • Smaller Cosmos are lovely in containers, showing off some of the finest lacy foliage of any annual.
  • Sow 3mm deep in spring at 21-24C in a good seed compost. Keep soil damp but not wet, sealing in a polythene bag after sowing is helpful.
  • Germination usually takes 5-10 days.
  • When seedlings are large enough to handle, transplant and grow on in cooler conditions.
  • Gradually acclimatise to outdoor conditions for 10-15 days before planting out after all risk of frost 60cm apart.
  • Plant in a sunny spot on light even poor quality well drained soil.

Cosmos
Useful Links

BBC Gardeners World – Gardening site of BBC

Royal Horticultural Society

Thompson Morgan seed varieties available

See more tips and help on Help growing Cosmos or search in the box center right.

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