Forum home› Plants
This Forum will close on Wednesday 27 March, 2024. Please refer to the announcement on the Discussions page for further detail.

Greenhouse for cosmos seedlings.

mchuamchua Posts: 210
in Plants
Hi, I’m transplanting some seedlings. To save room in my house I was going to use the geeenhouse instead. It is warm in there I don’t have any greenhouse sheeting at the moment to cover from direct sun. 

Will it be too warm for them? Shall I stick to the windowsill for the time being?  First time growing them.

Ty :smile:


«1

Posts

  • AnniDAnniD Posts: 12,585
    Have you got an old net curtain or something like that ,that you could use to shade them ?
  • WonkyWombleWonkyWomble Posts: 4,541
    Mine are in the greenhouse,  I leave the door wide open and window on vent
  • Butterfly66Butterfly66 Posts: 970
    I’ve don’t worry about shading until late May, early June. I’ve got automatic vents but also open the doors if the forecast is warm ( ignore wind chill/feels like temperatures, go off the forecast high)
     If you have a garden and a library, you have everything you need.”—Marcus Tullius Cicero
    East facing, top of a hill clay-loam, cultivated for centuries (7 years by me). Birmingham
  • mchuamchua Posts: 210
    Thank you very much.  I moved them to the greenhouse and they seem fine.  I leave the door and it’s only window open and close them at night. 
  • mchuamchua Posts: 210
    Although some of the seedlings fall over at the base, it’s not damping off, they just fall over because they’re tall. Even after transplanting into their own pot it’s tricky to keep them upright. Is that to do with light levels?
  • AnniDAnniD Posts: 12,585
    One trick when you're potting them on is to bury them up to , or near to, the lowest set of leaves.
    Also you need to keep turning them so that they keep returning to the upright position by facingtowards the light.
     I also gently brush the top of the leaves which in theory strengthens the plant.
  • mchuamchua Posts: 210
    AnniD said:
    One trick when you're potting them on is to bury them up to , or near to, the lowest set of leaves.
    Also you need to keep turning them so that they keep returning to the upright position by facingtowards the light.
     I also gently brush the top of the leaves which in theory strengthens the plant.
    Thanks, and yeah I saw that brushing trick on a YouTube video, it’s the Project Diaries guy.  :p
  • mchuamchua Posts: 210
    Hi, they have been in the ground now for almost a month and have some nice flowers and buds coming through.  They’re only around 30-40cm tall.  

    Do they normally take quite a long time to reach full height and spread?  Seems to be very slow growing. 
  • borgadrborgadr Posts: 718
    I wouldn't worry too much.  My seed-grown, greenhouse raised cosmos were planted out weeks ago and are only around 30-40cm, like yours.  They're "Purity" and "Rubenza" and they're in a variety of positions - drier, damper, full sun, part sun..  This early they still have plenty of growing to do, even if they're starting to flower (don't forget to deadhead).

    The ultimate size depends on the variety.  Some like Xanthos stay quite small.
  • mchuamchua Posts: 210
    Thanks yes I keep an eye on spent flowers and deadhead. I also pinched out the main stem early on which felt kind of brutal but I can see why now because they’re getting nice and bushy.
Sign In or Register to comment.