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Poorly Cosmos

I potted a Cosmos in a container a few months ago and it was really progressing nicely, flowering, bushing out, but lately it has not grown at all in height and does not look at all well image This is my first Cosmos, so I would appreciate any information on their likes/dislikes. Thanks


  • Cosmos like a nice sunny site free draining soil and not to be over watered then they are problem free and happy, also look out for black fly.

  • Lena NLena N Posts: 189

    Mine have grown well, despite being repeatedly attacked by slugs, but they haven't started flowering yet - nor do they look like they're about to anytime soon.  image  They are in full sun (not that we've had much over the last few weeks) and the soil is free draining.  Anything I should be doing to help them on their way?

  • Lena NLena N Posts: 189

    Thanks Verdun image

  • paulk2paulk2 Posts: 184

    I grew cosmos in a large pot last year and they were soaking up water at a great rate of knots even when I put them into a semi-shaded spot: I had to water at least twice a day. They did flower well, but this year I have planted them into the garden where they have grown well and have just starting flowering. I'd follow Verdun's advice and go with the liquid tomato food...

  • fidgetbonesfidgetbones Posts: 17,281

    Me too.

  • MeomyeMeomye Posts: 882
    Thanks. I will try the tomato feed although I am still confused about the watering, some say they like water, others not. Is it a case of watering only when they look droopy?
  • Kitty 2Kitty 2 Posts: 5,150

    My first time growing cosmos this year.  I have some in the ground (which are huge) and some in containers. The pot grown ones tend to look droopy when it's very warm and dry so I give them a good soaking and they soon perk up again. The ones in pots are smaller than those in the border but both are flowering nicely now.

    I have lots of pots in my garden and water according to the weather, when it's hot and sunny it can be every day, when it's chucking it down don't bother.

    Good luck with yours, hope you have some lovely blooms soon. image

  • me londonme london Posts: 119

    Ooops, I've watered cosmos every day for years, in pots or in the ground, I didn't know they didn't like lots of water.  The only real difference I've found growing them is sunshine. My garden where I live now is north facing, so they don't grow as good as where I used to live, but the ones at my allotment this year are the largest and prettiest I've ever grown them and the only difference is they are in the sunshine all day long.

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