The article discusses how factors like long fire cycles, high rainfall, and acidic bedrock help Sphagnum moss dominate forests and peatlands in southeastern Labrador, Canada. Changes in the environment often lead to Sphagnum taking over from other plants like feather mosses and lichens. After fires, Sphagnum girgensohnii carpets grow over feather mosses in forests. In bog hollows, Sphagnum lindbergii spreads over other plants on mud bottoms. And on bog hummocks, Sphagnum fuscum replaces Cladonia lichens after fires or moisture changes.