1. Humberboy

    Humberboy Apprentice Gardener

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    Hi
    I have looked at past threads about wood ash but I still cant make my mind up.
    Is it worth putting on the soil or not. I have been given 2 bags full from a reliable
    source. No nasties in it. My soil is Neutral and I don't have many problems growing
    anything. I put a few handfuls of B,F & Bone around in late spring. Is it worth using
    the wood ash as well or what.
    What would people think. Use it or bin it.
     
  2. Stephen Southwest

    Stephen Southwest Gardener

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    I put quite a lot of wood ash on the ground anywhere I'm going to be growing fruit (Inc trees, soft fruit, squashes), seed (beans, peas etc) or flowers...
     
  3. Butterfly6

    Butterfly6 Gardener

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    We mix the ash (from wood burner) into our compost bin.
     
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    • On the Levels

      On the Levels Super Gardener

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      Many many years ago one of the members of the garden club in our village told us to put our wood ash around the base of our tree peony which hadn't flowered in years. Yes you know what happened we did and next year it flowered and has continued to do so. Was it the wood ash? Or was it was just old enough to flower? We think the wood ash was the answer.
       
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      • shiney

        shiney President, Grumpy Old Men's Club Staff Member

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        We produce a lot of wood ash and I mix some of it into our compost heaps and spread a little on the bare soil of the veg plot. It helps increase the alkalinity of the soil but you mustn't overdo it and shouldn't use it around acid loving plants. It contains potassium which is good for a lot of green veggies, especially brassicas.

        Definitely don't use it where you grow potatoes. Don't put it directly onto leaves of plants. This is a good time of year to be using it.

        If it is very fine ash it is better to wear a mask and gloves when spreading it. If the ash has been exposed to a lot of rain a lot of the potassium will have been leached out as it is water soluble.
         
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        • Loofah

          Loofah Admin Staff Member

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          The ash pan from my burner gets chucked unceremoniously over the front borders, doesn't seem to hurts anything and the rain washes it in
           
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          • infradig

            infradig Total Gardener

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            It is useful as a additive to your compost heap, reduces acidity of grass mowings especially. A light dusting across layers.The inclusion of charred wood particles is especially good. It will survive composting and as 'bio-char' has addditional beneficial function once spread.
            Do not use ash or clinker from burning coal , coke or phurnicite. If you use your wood burner as an incinerator (yes, some people do !) , discard the ash.(and start saving for a new flue liner....)
             
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            • pete

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

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              Ash is good for breaking up clay, my garden had loads of it spread on it for many years before central heating was installed.
               
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              • Fat Controller

                Fat Controller 'Cuddly' Scottish Admin! Staff Member

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                I am curious - why don't potatoes like it?
                 
              • shiney

                shiney President, Grumpy Old Men's Club Staff Member

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                The potatoes don't mind it but they absorb potash and get too high a concentration of it. This can cause kidney problems . If you think they may have absorbed too high an amount of it (maybe accidentally has ash spread around them) you can still use them but should peel and cut them and then soak them in eater for a few hours. This will leach some of the potash from them.

                It's so much easier not to use the ash where you are going to plant them.
                 
              • Loofah

                Loofah Admin Staff Member

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                Would that warning apply to tomatoes as well?
                 
              • gks

                gks Total Gardener

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                To much wood ash around potatoes will likely result in scab caused by making the soil more alkaline.
                 
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                • gks

                  gks Total Gardener

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                  No, tomatoes will do better from the potash. You also have to take in to account the calcium from the wood ash, if your soil is already alkaline, then I would not recommend adding to much or any wood ash or spent mushroom compost on your garden, it will raise the PH level to high, especially if your growing potatoes, they prefer the soil a little more acidic.
                   
                • gks

                  gks Total Gardener

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                  You have already answered your own query. Neutral soil tends to have a PH between 6.5-7.5 ideal for most things to thrive. Now if your soil is towards the low end of that range, then a slight dusting would be more than adequate, if your soil is more towards the 7.5 range, then I would not be adding any at all as your going to make the soil to alkaline.
                   
                  Last edited: Feb 6, 2025 at 8:34 AM
                • Humberboy

                  Humberboy Apprentice Gardener

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                  Dear All

                  Thanks for the tips you have posted above.
                  I think I will use my wood ash around my fruit trees
                  and soft fruit and in the compost bin. But I will hold off
                  putting it on all the flower borders, But I will do a small experiment and put it in a small area and see what happens.
                  Have a Good Gardening Year.
                   
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