Try to aim for a seed spacing of at least
11.7 inches (30.0 cm) and sow at a depth of around
0.39 inches (1.0 cm). Soil temperature should be kept higher than
20°C / 68°F to ensure good germination.
By our calculations, you should look at sowing Saint-Saëns about 60 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Saint-Saëns is a tender plant.