Sow
0.49 inches (1.25 cm) deep with a guideline distance of
5.85 inches (15.0 cm). Soil temperature should be kept higher than
5°C / 41°F to ensure good germination.
By our calculations, you should look at sowing Batavia about 60 days before your last frost date.
As Batavia is tender, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.
By our calculations, you should look at planting out Batavia about 45 days before your last frost date.