Try to aim for a seed spacing of at least
5.85 inches (15.0 cm) and sow at a depth of around
0.0 inches (0.0 cm). Soil temperature should be kept higher than
16°C / 61°F to ensure good germination.
By our calculations, you should look at sowing Mertonensis about 70 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Mertonensis is a hardy plant.
Strawberry foxglove, Merton foxglove, Summer King