Cosmos very tall!

I have grown Cosmos from seed, they are planted out in the garden but just keep growing, some are 3 ft tall, lovely bushy plants but no flowers, what can I do to encourage them to flower?

In a world where you can be anything, always be kind.

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  • fidgetbonesfidgetbones Posts: 11,635

    They will flower. Just give them a feed of tomato fertiliser to encourage flowering. Too much nitrogen and they will grow huge before eventually flowering.

    It's not a mess, it's a nature reserve.
  • Pete8Pete8 Billericay, EssexPosts: 3,218

    I've been waiting a while for this one to flower now it's 6ft 6-
    image

  • Bright starBright star Wrea GreenPosts: 579

    Keep dead heading too, the more you do, the more flowers you will get. I've grown them from seed for the first time too and have completely fallen in love with them.

    image

    image

    Im definitely growing again next year, the bees love them and get cross when I'm dead heading the flowers. I now do it in the evening when not so many are about. 

    Life's tragedy is that we get old too soon and wise too late.

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  • Myosotis23Myosotis23 Posts: 47

    I am still waiting for my Cosmos to flower & they are now 5ft tall!

    In a world where you can be anything, always be kind.
  • Bright starBright star Wrea GreenPosts: 579

    Have you got flower buds, are they in the sun?

    Life's tragedy is that we get old too soon and wise too late.

  • BobTheGardenerBobTheGardener LeicsPosts: 6,628

    I'm growing 'Dwarf Cosmos Sonata mixed' and they are only dwarf compared the the 6ft monsters (ie the normal types I usually grow!)  These are 3-4ft and most are now in flower but it was a long time coming which I'm putting down the the weather - just not a very warm summer which is what they need and get in their native habitat (Mexico.)

    A trowel in the hand is worth a thousand lost under a bush.
  • Myosotis23Myosotis23 Posts: 47

    image Finally my Cosmos are in bud & about to flower.

    In a world where you can be anything, always be kind.
  • WillDBWillDB Posts: 1,173

    Better late than never :)

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