Look to ensure a distance
11.7 inches (30.0 cm) between French Summer seeds when sowing to make sure your seedlings have enough space. For optimal germination, soil temperature should be a minimum of
21°C / 70°F.
By our calculations, you should look at sowing French Summer about 42 days before your last frost date.
French Summer is hardy, so ensure you wait until all danger of frost has passed in your area before considering planting outside.
The species name vulgaris is from the Latin vulgus (“the multitude, the masses”) + -āris, and means “common”, “usual”, or “commonly known” .