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Dahlias 7 feet high ! whats going on?

My Fathers Dahlias are seven feet high (not including flowers) very healthy, but loosing strength in flower stems as growing skyward. South facing full sun, is this normal?

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  • punkdocpunkdoc Posts: 15,039

    Dahlia imperialis, will grow to 15 foot easily, and has been known to reach 30 foot.

    How can you lie there and think of England
    When you don't even know who's in the team

    S.Yorkshire/Derbyshire border
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