Germination usually 15-30 days. 1
Look to ensure a distance 7.8 inches (20.0 cm) between seeds when sowing - bury at a depth of at least 0.0 inches (0.0 cm) deep. Soil temperature should be kept higher than 18°C / 64°F to ensure good germination.1 “B-and-T-world-seeds”: http://b-and-t-world-seeds.com/carth.asp?species=Perilla%20frutescens%20Atropurpurea%20organic&sref=39215
2 “Daves Garden entry on Perilla frutescens Atropurpurea”: http://davesgarden.com/guides/pf/go/31437/
3 “Marthastewart.com entry on Shiso: Perilla frutescens Atropurpurea”: http://www.marthastewart.com/plant/perilla-frutescens-atropurpurea