Irish moss is a perennial plant that resembles moss. It grows well between patio stones and pavers in low-traffic areas. These hardy plants tolerate temperatures as low as -30 degrees F, making them well suited to even the coldest areas. Irish moss can be purchased from nurseries either as potted bedding plants or as small plugs. Plugs are the least expensive option if you plan to cover an entire patio in the plant. Irish moss that is properly cared for will quickly fill in the spaces between the plugs.
Provide some shade for the Irish moss plants on your patio, as they prefer only partial sun. Erect a pergola, or use large patio umbrellas with your patio furniture to provide this shade.
Work compost into the spaces between pavers before planting the Irish moss, as the plant requires soil rich in organic matter. Sprinkle fresh compost around the plants each spring to add further nutrients to the soil.
Work a time-released granular fertilizer into the soil before planting. Water the plants with a liquid plant feed every six weeks in spring and summer to replenish nutrients in the soil.
Keep the soil moist at all times but not soggy. Water daily during hot, dry weather to maintain soil moisture. Spray the plants twice daily, when necessary, to keep the soil surface moist.
Weed regularly, as weeds have a tendency to grow up through Irish moss, and eventually they can choke out the moss. Pluck the weeds out when they are first noticed, before they become established.