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