Advice on gravel in a bog garden, please

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Plans for the new home for my CPs are moving on.

It seems sensible to have a layer of something under the peat and perlite mix to allow any excess water to be drained off through the drain tap I'll be fitting.  Gravel of about one inch diameter is the obvious answer, but will it introduce unwanted minerals into the soil?


Edited by Guy
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Depends on the gravel, you need something inert, you obviously don't want anything alkaline, nor any gravel that will break down in acidic conditins. Often gravel for fish aquariums is OK but is generally smaller than the size you need. Granite chippings may fit the bill.



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