Sow at a depth of approx.
0.25 inches (0.64 cm) and aim for a distance of at least
0.98 inches (2.5 cm) between Curly leaf parsley plants. Soil temperature should be kept higher than
10°C / 50°F to ensure good germination.
By our calculations, you should look at sowing Green River about 35 days before your last frost date.
As Green River is hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.