Ensure a distance of
0.98 inches (2.5 cm) between seeds when sowing - look to sow at a depth of approximately
0.06 inches (0.15 cm).
By our calculations, you should look at sowing Horace Read about 49 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Horace Read is a hardy plant.