Where Does Green Staining Appear?Take a look at your garden and outdoor spaces. Check what is looking a bit green and unsightly.At this time of year, you will probably notice quite a bit of green algae and lichens growing on your stone patios, fencing, decking, greenhouses, walls, driveways, roofs, concrete areas, and even garden ornaments. Whilst it is generally harmless, it does not look terribl...