Irish moss is not actually a moss but a perennial plant, though the plants grow outward similarly to moss. To grow them as ground cover, you need moss seeds or seedlings and sand. Seeds germinate in 7 to 28 days.
- Choose a time and location
Irish moss grows best in areas that receive partial sunlight and have good drainage. Plan to sow the seeds or plant the seedlings in spring, after the last frost has passed.
- Prepare the soil
Use a gardening fork to till the soil. Mix the sand into the soil to create a well-draining location. Water the area before sowing or planting.
- Plant the moss
If using seeds, sprinkle them over the freshly-tilled soil. For seedlings, plant them 12 inches apart. Create a small hole for the roots, insert the plant and cover the roots with soil.
- Tend to the moss plants
Water the plants whenever the soil feels dry. This can be anywhere from every other day to twice a week, depending on the weather. Take care not to over-water the plants as they are prone to root rot.
- Shape the plants
Irish moss grows low to the ground and covers a wide surface. Shape the plants by pruning the stems so that they grow around stones or garden fixtures.
- Fertilize the plants
Irish moss does not require fertilizer until the second growing season. Use a general fertilizer after the first flowers have bloomed.