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Cosmos not germinating - again!

24

Posts

  • Pete.8Pete.8 Posts: 11,340
    All sown in the same compost at the same time:

    Xanthos = terrible, still at the cotyledon stage 4 weeks later (really wanted that one)

    I grew Xanthos 3 years ago, they grew well and when a mass of them (about 20) came into flower, it truly was a sight to behold.
    Then the flowers die and need dead-heading. The problem with Xanthos is that the replacement buds grow from the base of the dead-head you want to remove. If you remove the dead head, you also remove the bunch of buds attached to it. For that reason I've not grown it again.
    I've read that there is an improved Xanthos called Lemonade which doesn't have the same problem. I may try them next year.

    Billericay - Essex

    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
  • B3B3 Posts: 27,505
    I usually germinate mine outside.
    In London. Keen but lazy.
  • punkdocpunkdoc Posts: 15,039
    Jason3, that is not right, the seeds will quite happily germinate outside, at this time of year.
    How can you lie there and think of England
    When you don't even know who's in the team

    S.Yorkshire/Derbyshire border
  • LynLyn Posts: 23,190
    Agree Punkdoc, mine sit on the spare room table, I do keep a radiator on at nights, mainly to keep the Place aired. About 18c. Usually they just sit on my kitchen worktops but seeing as I have the holiday let now, I thought I may as well fill it with seeds.😀
    Never had a propagator but mine germinated in a  few days, I thought they were the easiest things to grow? 
    Gardening on the wild, windy west side of Dartmoor. 

  • NanniemoNanniemo Posts: 226
    I’ve had the same problem with seeds that came from the RHS free seeds that I get as a member. I followed their advice on sowing but have had no success with any of their seeds other than the foxgloves. I was unlucky with cosmos seeds I purchased last year as well, but fortunately the previous year I was successful and they actually self seeded in the beds so I had plants last year. I can’t understand where I’m going wrong as I’ve managed to get sweet peas and tomatoes germinated.
  • FireFire Posts: 19,096
    I tried to buy some plugs of tall cosmos but couldn't find any online. I phoned several local nurseries and they said they didn't sell much cosmos because it was unreliable to germinate and breaks too easily in transport. (!)
  • LynLyn Posts: 23,190
    Perhaps some of us should go into business growing cosmos for sale, that’s a super excuse for not having any😀
    Gardening on the wild, windy west side of Dartmoor. 

  • PurplerainPurplerain Posts: 1,053
    Pete8 said:
    All sown in the same compost at the same time:

    Xanthos = terrible, still at the cotyledon stage 4 weeks later (really wanted that one)

    I grew Xanthos 3 years ago, they grew well and when a mass of them (about 20) came into flower, it truly was a sight to behold.
    Then the flowers die and need dead-heading. The problem with Xanthos is that the replacement buds grow from the base of the dead-head you want to remove. If you remove the dead head, you also remove the bunch of buds attached to it. For that reason I've not grown it again.
    I've read that there is an improved Xanthos called Lemonade which doesn't have the same problem. I may try them next year.
    That's very interesting @Pete8 If they grow I will bear it in mind. Shame though, it is a lovely colour.
    SW Scotland
  • FireFire Posts: 19,096
    I'm beginning to think so. Mine that I just planted came up in a few days, in a pot in the garden. It is a bit of a mystery.
  • LynLyn Posts: 23,190
    I grew these a year or two ago, very pretty and the bees loved them. The buds on these were ok, flowers on different stalks. All germinated well. 

    Gardening on the wild, windy west side of Dartmoor. 

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