Sow at a depth of approx.
0.47 inches (1.2 cm) and aim for a distance of at least
0.98 inches (2.5 cm) between Turnip plants. Soil temperature should be kept higher than
4°C / 39°F to ensure good germination.
By our calculations, you should look at sowing Pétrowski about 35 days before your last frost date.