Growing from seed Sowing: Sow the seeds indoors during the period March to May. Planting: Cover the seeds thinly with soil and keep the soil evenly moist. Germination: The seeds need a temperature of about 20-22 °C to germinate and take 3 to 5 weeks to germinate at 16-20 °C. Transplanting: When the plants have developed 5 to 6 pairs of leaves, they can be planted out in a permanent location, with a distance of 30-35 cm between the plants.