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Cosmos very tall!

Myosotis23Myosotis23 Posts: 69
in Problem solving

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.

Posts

  • fidgetbonesfidgetbones Posts: 17,618

    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.

  • Pete.8Pete.8 Posts: 11,340

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


    Billericay - Essex

    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
  • Bright starBright star Posts: 1,153

    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: 69

    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 Posts: 1,153

    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 Posts: 11,384

    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: 69

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

    In a world where you can be anything, always be kind.
  • LoxleyLoxley Posts: 5,698

    Better late than never :)

    "What is hateful to you, do not do to your neighbour". 
  • geocoggs330044geocoggs330044 Posts: 1
    I have a cosmos plant growing in the gravel which is on top of a concrete base, terrace.  There us no actual soil. It is now just a fraction over 3.0m.  Is this a record?  I have other 'normal' size cosmos in the garden.  I have never seen anything this tall.
    I should add that I live in SW France. 
    GC. 
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