Sandstone Retaining Wall in Outdoor Bog: Mineral Leaching Risk?

Pittsburgh bog (10×3×2 ft, 2:1 peat:builder's sand) has sandstone wall inside liner, 5–6 sq ft below soil line. Grower concerned about mineral leaching affecting future Dionaea, Drosera, bog orchids.

Assessment

Sandstone = low risk. Unlike limestone (calcium carbonate) or concrete mortar (lime), sandstone is largely inert silica. With good water flow, any trace minerals flush out. Large bog volume further dilutes impact.

Proceed with companion plants confidently.