Why do wood decks and fences turn green and gray in Orlando?
Florida heat, humidity and rain keep wood damp for long periods. Algae and mildew grow on the surface, leaving green and black patches, especially on shaded boards and fence panels that face north. Sun and rain also turn untreated wood silver-gray, which is a natural weathering process and not always a sign of rot.
Sprinkler overspray adds to the problem and iron-rich irrigation water can leave orange marks on boards. Leaves, pollen and mud sit between boards and hold moisture.
Pressure-treated pine, cedar and composite decking all behave differently. Composite can usually take a gentle wash but can trap mildew in its textured surface. Tell us what your deck is made of, because it changes the method.

