The optimal temperature range for germination is around 21°C (70°F), but seeds can be sown outdoors as early as the ground can be worked.
Try to aim for a seed spacing of at least 9.75 inches (25.0 cm) and sow at a depth of around 0.25 inches (0.64 cm). Soil temperature should be kept higher than 18°C / 64°F to ensure good germination.The name houndstongue comes from the belief that it could ward off dog attacks if a leaf was worn in the shoe.