Sow
0.39 inches (1.0 cm) deep with a guideline distance of
11.7 inches (30.0 cm). Soil temperature should be kept higher than
20°C / 68°F to ensure good germination.
By our calculations, you should look at sowing Bishop of Oxford about 60 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Bishop of Oxford is a tender plant.