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Q - Transplanting a tree dahlia from a pot to the ground in August

FireFire North LondonPosts: 15,674
Here’s a question for the old hands who might have tried moving dahlias mid season - 

I have been away quite a bit this year, so when I got my three/four tree/v tall dahlia tubers this year 🙄.  I put them into medium pots to grow on. I had the intention of then putting them in the ground when landed back for good in August. They all seem to be doing well (they are not dead). But I now I ponder - transferring them to the ground for the late summer / autumn will almost certainly cause some stasis for weeks or more before they settle. 

I don’t expect the tall types to flower as 
- they generally need longer days that we can offer in the autumn
- I didn’t receive them until June
- they’ve been in pots that will be too small for them. 

Next year I can put them in the ground. Hopefully the tubers will be nice and fat and will shoot away fast - hopefully the plant getting to 3m or more creating an annual forest in my small garden. 

So - is it worth transplanting for August - Nov? The foliage is possibly robust enough to withstand slugs…



  • punkdocpunkdoc Sheffield, Derbyshire border.Posts: 12,003
    I think that any answer would only be guesswork, but I would probably go for it.
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  • Hostafan1Hostafan1 Posts: 32,434
    If you're ok to leave them in the ground over the winter, I'd plant them. 
    They form a huge, wide , star shaped group of tubers.
  • FireFire North LondonPosts: 15,674
    Thanks. I'll do that.
  • thevictorianthevictorian Posts: 581
    I don't grow tree dahlias but have to many dahlias than I can fit in the garden and the ones in the ground grow far more strongly and create much larger tubers than those in pots. 
    If they aren't pot bound, I don't think they will be slowed down much.  
  • FireFire North LondonPosts: 15,674
    I have SAS slugs so use pots for regular dahlias and it works pretty well. Tree dahlias were planned to go in the ground and I will go for it.
  • Hostafan1Hostafan1 Posts: 32,434
    In my experience, the tubers fan out in a shallow star, so much better in the ground where they can spread out
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