Look to ensure a distance
11.7 inches (30.0 cm) between Siloam Ethel Smith seeds when sowing to make sure your seedlings have enough space.
By our calculations, you should look at sowing Siloam Ethel Smith about 42 days before your last frost date.
Siloam Ethel Smith is hardy, so ensure you wait until all danger of frost has passed in your area before considering planting outside.