just like beach shingle but bought from local supplier - no mine don't sneeze and in a micro climate which suits horsfields. dry soil of any type heated up and indoors can be dry. humidity indoors is around 50% lower than outside so even humans get dryeyes etc. I think try and get a balance with the substrate , try natural as can be, CB
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Horsfields, Spur Thighed, & Marginata
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