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Very tall annual or biennial flower

RullahRullah Posts: 54
in Plants
Hello, 

I've stated an accidental tradition of growing one really tall plant every year. Last year it was a cosmos that grew to about 7ft tall (it was given to me as a tiny seedling from a friend and I had no idea what it was) and this year I let my old parsnips go to flower and they're now about 8ft tall. 

I like the drama the height created in the garden but wouldn't want to commit to a specific perennial or evergreen tree etc, I like the fact it's different every year!

So can anyone recommend any other flowering annuals or biennials that will grown up to or above 6ft for subsequent years?

Thanks 
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Posts

  • B3B3 Posts: 26,546
    Artichoke,chicory,hollyhock, mullein
    In London. Keen but lazy.
  • FireFire Posts: 17,390
    Planting in richer soil will help get height
  • NollieNollie Posts: 7,329
    Tithonia have got to 8ft for me. They are like orange beacons, the butterflies and bees love them.
    Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
  • newbie77newbie77 Posts: 1,784
    Some Dahlias can grow fairly tall and have dramatic flowers. 
    South West London
  • Busy-LizzieBusy-Lizzie Posts: 22,659
    Foxgloves, Delphiniums. Delphiniums are perennial though, but only live a few years.
    Dordogne and Norfolk. Clay in Dordogne, sandy in Norfolk.
  • LG_LG_ Posts: 4,255
    My Allium 'Summer Drummer' are currently about 7ft and still growing. Perennial, but you could dig them out?
    'If you have a garden and a library, you have everything you need.'
    - Cicero
  • raisingirlraisingirl Posts: 6,911
    Teasel or for foxgloves, digitalis pupurea v. gloxinioides can get really tall.

    I've got some monster thistles but you may not want to encourage those. Or hogweed which I love (as do the hoverflies) but you need some room
    “It's still magic even if you know how it's done.” 
  • D0rdogne_DamselD0rdogne_Damsel Posts: 4,059
    Sunflowers 
    "To nurture a garden is to feed not just the body, but the soul." — Alfred Austin
  • EustaceEustace Posts: 2,014
    edited June 2021
    My delphiniums and foxgloves are 6ft+.
    Oxford. The City of Dreaming Spires.
    And then my heart with pleasure fills,
    And dances with the daffodils (roses). Taking a bit of liberty with Wordsworth :)

  • FireFire Posts: 17,390
    Not perennial but valerian officinalis can get to seven ft in my garden. I treat it like an annual as it self seeds everywhere. Giant fennel seeds widely too.
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