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Very tall annual or biennial flower

RullahRullah Midlands UKPosts: 54
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 South East LondonPosts: 22,374
    Artichoke,chicory,hollyhock, mullein
    In London. Keen but lazy.
  • FireFire North LondonPosts: 15,669
    Planting in richer soil will help get height
  • NollieNollie Girona, Catalunya, Northen Spain.Posts: 5,961
    Tithonia have got to 8ft for me. They are like orange beacons, the butterflies and bees love them.
  • newbie77newbie77 LondonPosts: 1,386
    Some Dahlias can grow fairly tall and have dramatic flowers. 
  • Busy-LizzieBusy-Lizzie Posts: 19,196
    Foxgloves, Delphiniums. Delphiniums are perennial though, but only live a few years.
    Dordogne and Norfolk
  • LG_LG_ SE LondonPosts: 3,925
    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 East Devon, on the Edge of Exmoor.Posts: 5,905
    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
    “Light thinks it travels faster than anything but it is wrong. No matter how fast light travels, it finds the darkness has always got there first” 
  • D0rdogne_DamselD0rdogne_Damsel Saint Yrieix La Perche, Haute Vienne/Dordogne border. FrancePosts: 3,799
    Sunflowers 
    "To nurture a garden is to feed not just the body, but the soul." — Alfred Austin
  • EustaceEustace OxfordPosts: 1,126
    edited June 2021
    My delphiniums and foxgloves are 6ft+.
  • FireFire North LondonPosts: 15,669
    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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