For moss to grow on a tree, it must be a fully grown [[Oak Tree]], [[Maple Tree]], [[Pine Tree]], or [[Green Rain Trees|Green Rain Tree]] Type 1 or 2.<ref name="mossPossibleTrees" /> No other types of trees can grow moss. The tree's [[Trees#Growth Cycle|growth stage]] must also be at least 14.
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At the start of each day, all eligible trees will have a chance to grow Moss. The chance for a tree to grow moss varies depending on the weather and season. The growth chance is 10% on [[Sunny]] days, which decreases to 3.3% if it is [[Summer]]. On [[Rain|Rainy]] days, the growth chance is 20%.<ref name="mossGrowthSource" />
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Trees will have a 50% chance to receive a 10% boost to their moss growth chance if one of the following conditions are met:
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* The tree is a (non-temporary) Type 1 or Type 2 [[Green Rain Trees|Green Rain Tree]].
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* The tree's surrounding 5x5 grid contains a (non-temporary) Type 1 or Type 2 [[Green Rain Trees|Green Rain Tree]] that has Moss on it.
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During a [[Green Rain]], all trees that are able to grow Moss will instantly grow Moss, regardless of their growth stage.
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During [[Winter]], Moss cannot grow at all (except inside the [[Greenhouse]]), and all pre-existing Moss on trees is removed.
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Collecting moss from a tree reduces its growth stage to 12 - the amount of Moss it dropped.