Keeping cosmos

Hi, Is  it possible to keep Cosmos from year to year or is it purely an annual.  Have grown them for the first time this year and would love to keep them for next year, but wonder if it is best to start from scratch next year.



  • Jan58Jan58 Posts: 6

    I believe you can get the seeds from them and grow them on for the following year, have not done it myself but going to try this year, so fingers crossed.

  • LeggiLeggi Posts: 489

    Check your plant for it's prettiest flower and tie a small bit of string around the stem (if you want more than one flower to set seed you can do this to as many as you like) deadhead the plant as normal so it keeps flowering. When the plants begin to die off in autumn your selected flower heads will have turned in to seed heads, pick them off and store in paper bags over winter and you'll have your seeds for sowing in spring, you can then dig up the plant and compost it (or get rid however you usually do).

    I do this every year but I also buy new seeds to mix in (59p from Morrisons this year), I just love Cosmos far too much!

  • Jean GenieJean Genie Posts: 1,724

    Leggi - will this work for all cosmos ? I've been missing out !

  • LeggiLeggi Posts: 489

    If it's an annual cosmos I can't see why not, I also do the same with sunflowers, poppies, red flax, annual chrysanthemum and Verbena Bonariensis (and probably some others I've forgotten) image

  • Johnboy2Johnboy2 Posts: 19

    I tried the Double click cranberry and sea shells mixture this year and I'm so glad I did.  What fantastic plants they are and i hope they will go on for a lot longer.  Some of the plants have only just started flowering. You have to try the double click Cranberry ones though...they are stunning.


  • Jean GenieJean Genie Posts: 1,724

    Johnboy - I've just googled Double click cranberry cosmos and it is now on my shopping list ! Thanks for that - I've grown seashells . Just love the fluted petals .

  • Jean GenieJean Genie Posts: 1,724

    Sorry Leggi - thanks for your advice , I shall be wandering around the garden with a full set of paper bags come Autumn !

  • budlia63budlia63 Posts: 141

    i love these little gems i bought them outside my local asian grocers last year. this year i have grown my own and the display is even better. next year i will try my own seeds. great advice here  image

  • Thanks Leggi, I shall certainly try to grow them from seed.  There is a lovely deep maroonie colour which I would love for next year, so will certainly try to save the seed.  I presume you sow the seed in spring for planting out early summer?

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