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Canna: over wintering.

PosyPosy Posts: 3,601
I have grown a canna lily for the first time this year. Please could you advise me about how to keep it over winter. I do have a frost-free greenhouse.


  • FairygirlFairygirl Posts: 54,023
    In some areas they can stay outside with protection, if the ground is free draining, but if you have frosts, they need a greenhouse or similar  :)
    It's a place where beautiful isn't enough of a word....

    I live in west central Scotland - not where that photo is...
  • PosyPosy Posts: 3,601
    Thanks  FG. Should they be taken out and stored like dahlias or left in pots and watered sparingly? Or  indeed,  generously?
  • Same question from me too.  I moved mine into pots this year.  We have an unheated greenhouse. 
  • FairygirlFairygirl Posts: 54,023
    I've always had to bring them into my house, apart from when I had a conservatory. They just sat there, in their pots, not in any sun, until they started growing again. Then I did the usual watering a bit and repotting etc  :)
    It's a place where beautiful isn't enough of a word....

    I live in west central Scotland - not where that photo is...
  • We don't have the space to bring the garden pots indoors for Winter, so the greenhouse it shall be.  I'll wrap the pots in bubble wrap or fleece, but do I need to water them during Winter, or is it OK to let the soil completely dry out?

  • punkdocpunkdoc Posts: 14,379
    I chop mine to the ground and bring them under cover.
    It is best to keep them very slightly damp.
    How can you lie there and think of England
    When you don't even know who's in the team

    S.Yorkshire/Derbyshire border
  • Hostafan1Hostafan1 Posts: 34,586
    I split a massive clump last year, so , technically all the same plant. I dug some up and moved them into the polytunnel and left some in the ground in heavy soil over one of the wettest Devon winters and those in the ground emerged later, but soon caught up and over took those I planted out. 
    I'm not lifting any this winter
  • I cut mine down and keep in pots in an unprotected greenhouse over winter, no bubble wrap or fleece etc, just straight on the floor. A light watering once or twice over the whole winter does the trick for me (although the pots are large so they don't dry out.
  • DovefromaboveDovefromabove Posts: 86,168
    edited September 2020
    ours goes into the garage before the frosts start. It’s in a huge container so dries and  slowly doesn’t need watering all winter. I do remove the leaves as they die off by tugging them away from the base to guard against rot setting in, but otherwise it gets ignored until March
    when it’s repotted and brought into the light and warmer studio. It doesn’t go out until around  mid June. 

    Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.

  • Great, sort of similar to what I do with my Dahlia's.  We get lots of unseasonally warm days in Winter these days, and the greenhouse regularly gets quite warm, so I find I have to water the pots a little more often than one would expect.
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