Sow
0.5 inches (1.27 cm) deep with a guideline distance of
5.94 inches (15.24 cm). Soil temperature should be kept higher than
18°C / 64°F to ensure good germination.
By our calculations, you should look at sowing White Stem about 14 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as White Stem is a hardy plant.