Forum home Plants

Dahlia help - keep indoor a bit longer or move to cold frame?



  • ButtercupdaysButtercupdays Posts: 4,358
    Last year, after a frost-free winter here,  we had a sharp frost at the end of May. That took its toll on all the plants, even hardy perennials that had come on early.
    Hardened off or not, something similar would probably finish  off your dahlias or at the very least set them back severely. They are not safe outside unprotected until all risk of frost is over.
  • punkdocpunkdoc Posts: 13,280
    Agree with @Buttercupdays, it is too early to have Dahlias outside, especially young ones.
    There are ashtrays of emulsion,
    for the fag ends of the aristocracy.

    S.Yorkshire/Derbyshire border
  • SophieKSophieK Posts: 242
    Reminds me, I need to prick out my Bishop’s children seedlings this weekend.
    Am potting mine up this weekend, they're bursting out of their cells
  • SophieKSophieK Posts: 242
    @Buttercupdays I am in London and the garden is very protected. Supposedly our average last frost is March 11th to 20th (according to the web), so I will perhaps not plant them our but take them outside in their pots everyday and keep an eye on the night temperatures.
  • AthelasAthelas Posts: 702
    I use the Metcheck forecast to keep an eye on frost risk — go to, select ‘Weather’ > ‘Forecast’ > ‘Frost risk’

    The blue areas signify the risk of ground frost, and orange air frost.

  • REMF33REMF33 Posts: 641
    edited March 2021
    @sophiek I noticed that one of mine - a Mambo - has an inch of growth now :) This is one that was in an unheated indoor space down the side of the house. Maybe I should try to make space for them all in here, but they have to go on a shoulder height shelf which is not ideal in terms of remembering to water when needed.
  • SophieKSophieK Posts: 242
    @Athelas  Thank you very much for the link, it'll be very useful!!

    @REMF33 Keeping on top of the watering is definitely quite time consuming
  • mac12mac12 Posts: 153
    He's me thinking it's still a bit too early to start them off yet as still 8 weeks until I can plant them outside 
  • I'm getting very worried about mine now I've seen all yours. 😱 I have 6 new ones in pots in the GH and so far I've seen very little sign of movement. Possibly, and it may be my imagination, the soil has risen slightly. Time to panic?
    "To nurture a garden is to feed not just the body, but the soul." — Alfred Austin
  • edited April 2021
    As with above, I bought 6 sets of tubers of a new variety to try this year - Happy Single Kiss. I potted them up on 3rd March and kept them indoors for another week or two until the mercury started hitting double figures then I moved them into my unheated greenhouse which has been getting the sun most of the day. I have just taken them back in as we are due this cold snap over the next few days (can already feel the chill in the air) but I'm already worried they've not been kept warm enough as I can literally see zero movement, even though the past couple of weeks have been unseasonably mild with above average temps.

    Does anyone have any experience with this variety and should I be worried or can they take a while to take off? Is the damage done or will they still be okay? I'm going to keep them indoors for as long as possible until I start to see some movement, but at what point should I be worried if it isn't now?
Sign In or Register to comment.