Scottish Moss - Knowledgebase Question

Sutton, Ma
Question by Bousquet694
April 28, 2009
I bought some moss today to put inbetween some flagstone I have, I am curious as to how soon it spreads? A month? A season? as well as how to keep it from spreading into a nearby flowerbed if that is even a possibility.I dont mind if it spreads out into the lawn but will it do so evenly so I can still mow around it or do I need to put up some form of border?

Answer from NGA
April 28, 2009


Though not a true moss, Irish moss (sometimes called Scotch moss) forms a tight mound like moss does, and it works well as a ground cover around stepping-stones and in rockeries. Irish moss thrives in USDA zones 6 to 9. Irish moss fits tightly around stepping-stones and can take light foot traffic. Ir grows about 6 inches high and spreads about 8 inches. It will take a full season for the plant to establish and to spread out to about 8 inches. If it begins to encroach nearby flower beds it is easy to remove because it is shallow rooted. Simply pull it up, roots and all and plant it elsewhere. I would scout the borders of the lawn and flower beds every few weeks and if it is spreading into these places, remove it at once. It is a fairly easy plant to keep under control.

Good luck with your garden!

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