Moss also grows on the surface of potting soil that has been undisturbed for a few years. I notice it especially on potted sedums that never get fertilized. The sedum takes over in the summer, then it dies back exposing the moss during it's active winter season.
One winter Gertrude Jekyll wrote that the north side of her tree trunks were a hazy gray green and that the green of ivy and yew had receded to near black. Only the moss, she noticed, was a "positive" green.
As a tribute to Miss Jekyll I've been cultivating some moss / sedum containers. Cultivate is the wrong word because enlightened neglect is the formula. Sun in summer, no fertilizer, no supplemental water, a couple years' patience.
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