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