Mold and other types of growth thrive in shady areas with excessive moisture. Decomposing organic matter like excessive thatch, mulch, and buried material like wood or roots will harbor this growth as well.
Removing these organic fungi is crucial for a safe and appealing outdoor area. If left untreated, they can cause discoloration, an unsightly look, and a slippery surface to walk on.
The best way to prevent moss or algae from growing is to keep your stones as clean and dry as possible. Trim away trees and other plants that are blocking sunlight from your pavers, and make sure to select the correct type and amount of mulch. Adding a slight slope to your surface will help prevent standing water, as will drainage pathways made of gravel.
Also, adding a polytherane coating on pavers will seal and protect joints and surfaces from invasive mold. The application of a polytherane coating will also create a nice wet look, gloss appearance that will bring out the colors in your pavers.