Direct sow parsley seed outdoors from March to July. Grow parsley in a well prepared seedbed in full sun or partial shade. Sow seeds thinly at a depth of 1cm (½in) in drills 30cm apart. Parsley seeds are very slow to germinate taking up to 28 days, especially in wet, cold soils.
Seeds can also be sown indoors or under glass from August to February for fresh leaves all year round. Sow into 7.5cm (3”) pots of free-draining seed compost, maintaining a temperature of 18-21C (65-70F) until after germination. When large enough to handle, thin out seedlings to 23cm (9”) apart. Gradually acclimatise parsley plants to outdoor conditions over 7 – 10 days before planting outdoors when risk of frost has passed.