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Need advice please. I have a row of dahlias which was planted 5 years ago.  Here in the Westcountry, it isn't necessary to dig them up every autumn, so I cut them back in the winter and give a good mulch.  But, they are now overcrowded and need to be thinned out.  When is the best time to do this, now or next spring? 

punkdoc

I wouldnt touch them now. Wait until they are starting into growth next spring and do it then.

But remember Auntie E when you dig up those dahlias each divided piece must have a piece of stem or they will not grow.  

Thank you so much for your advice, especially the reminder that each divided piece must have a stem. I wouldn't have done that!    I will leave them alone until spring and then tackle the division! 

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