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How to over winter hardy annuals in pots?

CraighBCraighB Posts: 738

Hi, I have sown some cornflowers and love in a mist and i will have to put them in pots as I have nowhere in the garden to sow them directly. when spring comes and I have made room I will plant the in the borders. However I was wondering if I put each individual seedling into a 9cm pot will the size be sufficient to last them until next spring or will they need potting on to a bigger pot?

Also what happens to them over winter? Will they grow to a certain size and then just pause and carry on growing again in spring or will I have to chop down anything that has grown this year to the base Like you do with perennials?

thanks :)

Last edited: 16 September 2016 17:10:13


  • I would say 9cm pots would be fine as they won't do much growing over winter. Don't chop them down. Keep them somewhere sheltered so they don't get too wet or freeze as this will damage the roots. I have self sown seedlings of nigella in my borders. If there is a frost they go all limp but then recover, but in pots the roots are more vulnerable.

  • CraighBCraighB Posts: 738

    Ah that's good to know. I will be keeping them on the decking close to the house and they say it's usually a few degrees higher the close to the house you are. So I'm hoping if I huddle them all together along with some perennials I have sown for next year that they will survive :)

    Mind you the previous winter we had was actually quite mild here in the Midlands.

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