Look to ensure a distance
11.7 inches (30.0 cm) between Ruffian's Apprentice seeds when sowing to make sure your seedlings have enough space.
By our calculations, you should look at sowing Ruffian's Apprentice about 42 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Ruffian's Apprentice is a hardy plant.