Tree dahlia - dahlia imperilis

Hello!

I am growing tree dahlia (dahlia imperialis). They got up to 1 metre/3ft this year and have some thick rhizomes. I heard that they are hardy enough to leave in the ground (I have some raised beds that have great drainage). Anyone else tried leaving them out? Also year 2 - are they liable to flower supposing no frost till Dec?

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  • punkdocpunkdoc Sheffield, Derbyshire border.Posts: 7,188

    Some people manage to over winter dahlia tubers others dont. The tree dahlias are no hardier than other dahlias.

    It is rare for tree dahlias to flower in the UK unless we get a particularly hot summer.

    Woke up again
    To my chagrin
    Getting sick and tired of
    Feeling sick and tired again
  • Thanks punkdoc.

    The foliage is impressive by itself but would be nice to get some flowers and seed. From looking on google tree dahlis has flowered in London and the SE and in Cumbria, though rarely.

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