Try to aim for a seed spacing of at least
11.7 inches (30.0 cm) and sow at a depth of around
0.47 inches (1.2 cm). Soil temperature should be kept higher than
16°C / 61°F to ensure good germination.
By our calculations, you should look at sowing Beit Alpha about 14 days after your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Beit Alpha is a tender plant.