Keeping cosmos short

Hello everybody, I inadvertedly bought regular Cosmos bipinnatus seeds, meaning to purchase dwarf Cosmos (I'm growing them in pots).

My question is, by breaking them can I make them flower at a shorter height? I doubt I have large enough pots for their full height.

Thank you!


  • jude5jude5 Posts: 65

    Hi Jovia,

    I've grown Cosmos in big pots before, by pinching out the tips you will get good bushy plants but they will still be quite tall and may need support. They can look quite spectacular thoughimage

  • LisaJLisaJ GlasgowPosts: 46

    I'm wondering how big they should be before you pinch them out.  Mine are about 8", the earliest sown ones are anyway.  I didn't make a very good job of it last year, some grew lovely and bushy and others still just grew one stem.

  • goochiegoochie Posts: 17

    pinch out to enhance the bushy effect but leave in greenhouse a little longer to make an even stronger plant.  The deep red variety are fab with grasses.

  • LisaJLisaJ GlasgowPosts: 46

    Thanks, They will definitely be in the greenhouse for a while longer, it was a bit chilly in Glasgow last night.

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