Many seeds require specific sowing treatments, such as light-exclusion and scarification (scratching or nicking the seed coat), so check seed packets for specific instructions. Fill the container with compost, level, firm gently and water well. Sow seeds thinly. Very small seeds can be mixed with fine sand before sowing to obtain more even distribution. Sift a fine layer of compost or vermiculite over the seeds. Label, lightly water again and either cover with clear polythene and maintain a temperature of 18ºC or place in a heated propagator.