How do you make Magnolia Grandiflora in containers come into flower?

Discussion in 'Container Gardening' started by Howard Stone, Jun 25, 2019.

  1. Howard Stone

    Howard Stone Gardener

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    I have noticed that these do well in containers -- large ones obviously -- and last year I planted three of them (var. Little Gem) as an experiment. They're in an ericacious compost and they get some Osmocote type fertilzer and regular watering.

    To my great surprise they've all burst into flower!

    Now I remember that about 20 years I planted the same variety in someone's garden, it came with a flower bud which duly opened and . . . it has never flowered since.

    I guess that commercial growers are doing something to encourage the production of buds.

    But what?
     
  2. Marley Farley

    Marley Farley Affable Admin! Staff Member

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    Hi @Howard Stone you didn’t prune them in Autum or winter did you, if you did it would have cut off this year’s flower buds. prune after flowering if necessary..
    They don’t like a high nitrogen feed either.. I don’t know what the NPK is of the one you are using, but they like NPK around 10:20:20 or 10:20:15. After that not sure, those are usually the main reason for no flowers.. :scratch:
     
  3. pete

    pete Growing a bit of this and a bit of that....

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    I've never seen one in a pot, apart from in a garden centre/ nursery, most seem to be pretty big trees.
    Root restriction might just force earlier flowering.
     
  4. Howard Stone

    Howard Stone Gardener

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    In fact they're often seen in pots in London, but I've never seen one in flower. They get quite big (they're in big pots), maybe 6 feet or so, and seem happy -- always lots of shiny green leaves. Mine are only about 24 inches at the moment!
     
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    • Howard Stone

      Howard Stone Gardener

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      Feeding them with a high potash food makes good sense, and I'll do it now since I think they make flower buds the year before they open -- can someone confirm that?

      The flowers in my potted plants are the perfect complement for white water lilies, they are near a pond!
       
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      • Marley Farley

        Marley Farley Affable Admin! Staff Member

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        They do @Howard Stone, that’s why you prune if you need to do it after flowering.. Any later and you risk losing the flower buds forming for following year.. :thumbsup:
         
      • pete

        pete Growing a bit of this and a bit of that....

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        The ones I've seen flower sporadically all summer.
        From last month right into Sept.
         
      • Howard Stone

        Howard Stone Gardener

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        Just given mine a good dose of slow release high potash fertiliser, fingers crossed.
         
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