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overwintering Dhalias

Monty Don et al. discuss how to overwinter the tubers.My  Dhalias have only roots,could someone please advise the best course of action,many thanks.


  • PosyPosy Posts: 3,601

    I'm not sure what you mean, Des. Are they very young plants or did they grow poorly and not form tubers? I am not sure if they will survive winter but your best bet is a frost free greenhouse, cool and bright and very little watering, I should think. If they are not very special, it might not be worth the trouble because well formed tubers will be available and inexpensive in Spring.

  • Paul B3Paul B3 Posts: 3,121

    My Dahlia tubers are washed and dried anytime now , removing all traces of soil ; stored in the dark , bone-dry in a cool spare room upstairs . I do this every year and they always seem to 'get through' .

  • I have grown some of my Dahlias from seed for the first time.  I was told that they would form tubers this year, so should I lift them just as I do with established tubers or leave them in their large pots and put them somewhere sheltered over the winter?

  • PosyPosy Posts: 3,601

    With your mild winters they should be fine in a sheltered position, though they probably have made tubers if you prefer to lift them.

  • LynLyn Posts: 22,861

    I grow Bishops Children from seed, it’s amaing how big the tubers are now, I have brought the ones I grew in big tubs, into the greenhouse while the soil drys off on them then, when they are dry, i will wrap them in newspaper and store till next year, the ones in the garden stay out with a big pile of home made compost on the top. 

    I wonder if the OP has those tiny ones they sell in supermarkets, if they were full sized dahlias they would have made tubers. If so, I would dump them and start again next year. 

    Last edited: 23 October 2017 02:05:17

    Gardening on the wild, windy west side of Dartmoor. 

  • Thanks Posy and Lyn.  I will put the seeded (tubers) either in or just outside the cold greenhouse, with a covering and hope for the best.  I am very pleased with my seeded Dahlias, they took a while to get going but have flowered continually over the summer and now into the autumn.

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