Using an [[Axe]] on a tapped tree covered in moss will remove the tapper and the moss in one hit, while a [[Pickaxe]] will remove only the tapper on the first hit. Using any other methods will harvest moss without collecting the tapper.
Moss becomes much more common during the [[Weather#Green Rain|Green Rain]] event, covering most mossy trees. This weather event also spawns exclusive weeds that drop Moss.