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Wisteria - container growing and drainage query

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  • Wisteria - container growing and drainage query

    Last summer I transplanted a wisteria that was originally the result of a layered shoot.
    Since being severed from the parent specimen and dug up - several years ago now - the wisteria has been kept in a makeshift box filled with soil whilst a more permanent site was sought for it.
    It is now in a big, barrel shaped container (£15 down from £175 because it was cracked - thank you fibre glass repair kit). I would estimate that it holds 500-600 L of compost (though don't quote me on that ). Because of the size, I reasoned it was easier to mix the compost, grit, and loam together in the container, then scoop out a hole to drop the root ball of the wisteria into. However, in doing this I made one textbook error - neglecting to fill the bottom of the container with a layer of drainage material. There's a few drainage holes drilled into the bottom, and the container sits on bricks, which would help. I reckon the holes could clog up over time.
    I'm wondering whether the pot is likely to be free draining enough for a wisteria.
    I did get some lovely bottle green leaves on the plant towards the end of the season following transplant (after last seasons' mainly yellow ones), so it was obviously needing to be moved. But that was then (and it was still warm).
    Digging it all out again to effectively start over with the pot preparation would be a giant hassle, and there's also the issue of too much root disturbance, but it'd be better to do this now if needed before the plant gets any bigger.

    Any thoughts? Cheers.

  • #2
    If you think the drainage is insufficient I would make additional holes at the base around the outside (rather than underneath). The holes underneath will still be needed for drainage from the centre of the pot though ...

    Its a myth (albeit contrary to what people would naturall think) that drainage stones in the bottom of a pot help drainage, in fact the moisture doesn't like to transition between materials of different types, so the layer between compost and stones doesn't work as well as you would expect - plus the stones reduce the amount of compost, available to the roots, which is in the container.

    That said, if you have too few drainage holes in the bottom of the container it won't drain well!

    You could cover the surface with a plastic/similar sheet to keep rain off so that doesn't add to the moisture in the container - or just do that during winter months when the plant is not in leaf / not drinking as much
    K's Garden blog the story of the creation of our garden

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    • #3
      Hi Kristen.

      Cheers for that. Puts my mind at rest

      Re. the porous material in the bottom of a container, normally I'd make it a couple of inches deep, then put a piece of weed fabric on top before adding the compost. I figured keeping the two mediums separate would help maintain the air spaces between the stones.

      Would you know specifically whether wisteria would do well / struggle, in the pot as I've described it? I.e. not as free draining as it could be.

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      • #4
        Not tried a Wisteria in a pot so no knowledge that would help, sorry. I've seen Bonsai Wisteria in the pot though!
        K's Garden blog the story of the creation of our garden

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