Days to Germination:14-18 days
Saponaria vaccaria. Sow Soapwort seeds outdoors in spring after the last frost date, barely covering them with soil. Keep the seed bed moist. To sow indoors, wrap the seeds in a moist paper towel and a plastic bag and chill them for 4 weeks before sowing them on the surface of a fine seed starting mix, firmly pressing them into the soil. The seeds need light to germinate. Harden off the seedlings by slowly introducing them to the outdoors over the span of a week, and then thin or transplant trios of seedlings to 18" apart in full sun and moist, fertile, well-drained soil after all danger of frost has passed. Water Soapwort regularly. The plant readily self-seeds if happy, and will pop up here and there next season, creating wonderfully unexpected vignettes. Annual. Late spring and summer flowering. Height: 12" to 24".