Allotment Gardening Advice Help Chat
Growing => General Gardening => Topic started by: ljshguighuf on May 11, 2022, 11:25
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Hi all,
I moved house last year and am going to remove some artificial grass to replace with raised beds and turf. Underneath the astroturf is quite a deep layer of granite dust that prevented weeds from growing through it.
Just digging out a 4ft x 4ft square I managed to 1/3 fill a 1 tonne bag with the stuff so completely removing it is going to be a nightmare. Is there anything wrong with just digging deeper and mixing it into the soil?
Thanks in advance for your replies
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Are you sure it is granite dust, or could it be something else e.g. limestone?
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If it was laid properly it will be granite dust. I can’t see why you can’t incorporate this with the soil. It will give you a gritty texture. Not at all bad.
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Thanks for the replies. I think it's granite dust, as it seems to have been laid very well. Is there any way of telling?
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Easiest way would be to have a zoomed in look at pictures on a website selling aggregates like this one.
https://www.aggregatesdirect.co.uk/product/grano-dust/?attribute_pa_size=bulk-bag&utm_source=Google%20Shopping&utm_campaign=Aggregates%20Direct&utm_medium=cpc&utm_term=36403&campaign=11719149002&content=482692664042&keyword=36403&gclid=EAIaIQobChMIoJOCrNTZ9wIVL49oCR0Xqgn5EAQYCCABEgKqSvD_BwE
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Carefully drop a smidge of battery acid (or it may work with strong vinegar) and if it fizzes it's limestone. If not it's granite. Cheers, Tony.
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I'd avoid trying battery acid (concentrated sulfuric acid contaminated with lead and antimony).
Drop a bit of the suspected granite dust into a clear glass with vinegar. It will react more slowly, but will produce a slow fizz.
A geologists field kit for this test is a dropper bottle with 10% hydrochloric acid (=muriatic acid).
Limestone is usually softer than granite (except where it contains incorporated sand or silicified fossils).