Select a location for your Irish moss lawn. The soil can be clay, sandy or loam, as long as it is well-drained and retains moisture well. Irish moss grows best in full sun in cool climates and partial sun in warm climates.
Rake any large rocks or weeds out of the soil. Add a 3- to 4-inch layer of compost on top of the soil, and work it into the soil to a depth of six to eight inches.
Sprinkle Irish moss seeds onto the prepared soil at the rate of about 30 seeds per square foot. If you’re planting plugs, plant them about six to nine inches apart in the soil.
Keep the soil moist at all times when the Irish moss is growing. Do not let the soil dry out, but don’t keep it soggy, either.