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Tree planting advice - bad soil

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  • Tree planting advice - bad soil

    Morning all,
    to brighten the dark season I thought I'll make a start at getting some plants into the slate gravel desert that is our front garden. I would like to plant a bare root rowan ('edulis' cultivar) and an 'Evereste' crab apple.

    I have never planted trees before, and I am getting confused by the contradictory advice in different books/websites...

    So far, I have dug square holes of about 1 metre side length, to a little more than a spade's depth.

    In doing so, I discovered that one planting location is builder's rubble:


    and the other compacted clay over builder's rubble:


    It took a week and a pick-axe to dig these holes. About 30% of the volume consisted of big stones, which I removed by hand.


    I haven't taken out stones smaller than a chicken's egg, of which there are hundreds...

    Will trees even grow in that kind of soil...?

    I should also say I am planning to plant the trees on a slight mound, as the soil here (South Wales) is very wet for much of the year.
    The whole area is covered in slate gravel over weed membrane, which I am planning to put back on top once the trees are planted. So I would struggle to regularly mulch those trees, but at least they won't have any competition from other plants.

    From what I have read, I now don't know if or to what extent to improve the soil that goes back into the planting holes??

    Some seem to say not to improve the soil, as it creates a pond and the roots won't then go exploring. But would the roots ever manage to grow out into that kind of clay/rubble, or am I effectively growing those trees in a container anyway?

    Others write to completely replace the soil with good compost to give the tree the best start, or to mix compost and original soil to varying percentages?
    Attached Files

  • #2
    With it being clay soil, I would think the stones will help with drainage, the roots will find their way down. I would be tempted to dig the planting hole, add some organic matter & plant the tree but then I would do that with everything so not much help really.
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    • #3
      Did you see any signs of life at all? An earthworm, existing plant roots?

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      • #4
        Not one single earthworm...

        The roots of a shrub that used to grow nearish to the compacted clay planting site all grew directly underneath the weed membrane, on top of the soil.

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        • #5
          I am with Bigmally here. It may pay big time to add well rotted manure to the stones and "mix" them up a bit and then plant the trees with a good topsoil and compost mix. You should also endeavour to make sure that the trees are well watered over the (maybe) hot period of the year. If there are no worms but you add the well rotted manure then "they will come" as was said in that famous film.

          Good luck

          Bill

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          • #6
            I'm also with BM and Bill, just ignore the clay, add your compost to the planting hole. I'm also on clay soil, if you stick a spade it and lift you'll hit clay straight away and the ground can be saturated in the wet months but all the trees in my garden are very healthy.

            PS..I'm originally from South Wales where abouts are you?
            Last edited by Scarlet; 06-01-2017, 01:18 PM.

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            • #7
              Thank you all.

              I shall mix in some manure & compost with the soil.

              Gives me a chance to adjust the soil pH a bit as well. The soil is very alkaline, which I know the crab apple and rowan won't like...

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              • #8
                Originally posted by Scarlet View Post
                I'm also with BM and Bill, just ignore the clay, add your compost to the planting hole. I'm also on clay soil, if you stick a spade it and lift you'll hit clay straight away and the ground can be saturated in the wet months but all the trees in my garden are very healthy.

                PS..I'm originally from South Wales where abouts are you?
                a sunny bit no doubt
                sigpic
                1574 gin and tonics please Monica, large ones.

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                • #9
                  Nah! I'm a valleys girl...lots of shade there

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                  • #10
                    hmm - in my experience Valleys vs South Wales leads to trouble
                    maybe only football/rugby not gardening...
                    sigpic
                    1574 gin and tonics please Monica, large ones.

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