Answer: If you can't find moss in your local nursery, you can grow your own by either taking plugs from existing mossy areas or allowing it to grow naturally in the spots around your walkway and rock garden. Do this by acidifying the soil (moss won't grow in alkaline soils). You can do this by sprinkling aluminum sulfate to acidify the soil. If you can't collect and plant plugs of moss from another source, you simply need to keep leaves off of the areas you want to grow moss. If an area is kept clear of leaves it will develop a thin moss skin within a year and a good, thick moss cover in about three years. The main care that it takes is pulling any weeds that come up while the moss is becoming established and then keeping the leaves blown off of it every fall.
Enjoy your new moss garden!
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