Planting Scotch Moss Between Patio Stones: Keys to Success

Scotch moss (Sagina subulata)—also called Irish moss—isn't a true moss but forms a similar low, tufted green carpet. For success between patio stones:

• Light: Prefers semi-shade; struggles in full sun, especially during hot summers.
• Soil: Excavate 6 inches deep between stones and fill with high-quality outdoor planting mix (not potting soil, which retains too much moisture).
• Planting: Divide nursery root balls by hand and plant pieces 4 inches apart in the cracks.
• Watering: Water in morning so foliage dries before nightfall. Avoid both drought and soggy conditions.

The three main enemies: dry soil, waterlogged soil, and high humidity. If Scotch moss fails, try super-dwarf mondo grass (Ophiopogon japonicus 'Nana') for shade, or creeping thyme (Thymus serpyllum) for sunnier spots.