Irish moss does best with morning sun and afternoon shade. If your weather is very hot, this may cause the moss to turn brown despite being moist. It should recover when cooler temps return. Irish moss can turn brown as it ages. If any of these patches are old, trim out the brown sections. https://www.gardeningknowhow.com/ornamental/groundcover/irish-moss/growing-irish-moss-plants.htm
Answered on July 4, 2018
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