Look to ensure a distance
11.7 inches (30.0 cm) between Silver seeds when sowing to make sure your seedlings have enough space. Soil temperature should be kept higher than
21°C / 70°F to ensure good germination.
By our calculations, you should look at sowing Silver about 42 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Silver is a hardy plant.