Answer: If left unattended for years on end, I suppose Scotch (or Irish) moss can become invasive, but I've found it to be very easy to control. Each plant spreads out about 8 inches in diameter and creeps slowly so if you see it trying to escape from the planting bed you can simply dig it up and plant it elsewhere. Most creeping plants will move towards the edge of a planting bed so as long as you expect this pattern of growth, all you need to do is check on it through the summer and cut it back with a shovel or hand trowel. Hope this answers your question!
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