To grow our curly parsley, plant the seeds outdoors in March or April, and again in late summer for early growth the next spring. You can directly sow outdoors in early spring, or after the soil has warmed up, ideally around 21 °C (70 °F). For winter crops, start new seeds in late summer and transplant out to a warm, sunny location by September. As parsley is slow to germinate and emerge from the soil, often taking up to 6 weeks, soaking the seeds for 24 hours in lukewarm water will help to hasten the sprouting process.
Sow parsley seed 0.5 cm (1/4 inch) deep, with a row space of 15 cm to 20 cm (6-8 inches) apart.