Look to ensure a distance
9.75 inches (25.0 cm) between seeds when sowing - bury at a depth of at least
1.95 inches (5.0 cm) deep.
By our calculations, you should look at sowing Optica about 1 days after your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Optica is a hardy plant.