Sow Outside: Cover seed. Start of spring - before the last frost, or towards the end of autumn.
Sow Inside: Germination time: two to four weeks. Temperature: 55°F (13°C).
Seven or eight weeks before the expected last frost. Transplant outdoors following the last frost. Space at 2 to 8 inches (5—20 cm).
Requirements and care: Full sunlight or partial afternoon shade in hotter areas. Moist, sandy soil. Light soil, poor soil. Short-lasting perennial plant, replace regularly for best results. Propagate: by dividing in the spring in cooler areas or the autumn in warmer areas. Protect from aphids.
Closely Related Species: Pinks and Carnations
Miscellaneous: Due to its small size Sagina subulata cv. Aurea (Scotch/Irish moss) makes a great plant to grown between cracks in paving stones.
How to grow Irish Moss and Other Sagina
The seeds of Irish Moss and other Sagina species can be sown outdoors either in autumn or the beginning of spring.
Once sown lightly cover the seed. Plants should be spaced about 10 cm (4 inches) apart unless it is a spreading variety, then they should be grown about 20 cm (8 inches) apart.
Irish Moss likes to be grown in sunny areas that have afternoon shade, and thrives in a moist, light, and sandy soil.
If starting off indoors then do so about 7 or 8 weeks before the last frost of spring.
It should take two or three weeks for the seeds to germinate at 12 degrees centigrade (54°F). Transplant them out after the last frost of spring.
Caring for Sagina
It is easy to care for Sagina plants. They like a moist soil, so water them frequently; also give them a regular feed.
It may be necessary to grow Irish Moss near plants that attract ladybirds as aphids love to feed on them.