Green between pavers in shade is usually moss—not mold. Harmless, just aesthetic. Gray/black darkening suggests mold. Cause: excess shade and moisture. No eco-friendly chemical fix—scrape manually with a trowel. Test diluted bleach or fungicide on a hidden spot first; may discolor pavers.
Long-term: increase sun (limb up trees), improve drainage, or accept moss as a soft, green joint filler.
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