May - May
May - June
July - September
Since the Black Forest plant prefers a warmer climate, you have to pre-cultivate the seeds indoors for 3-4 weeks until the outside temperature has risen enough. Sow 1 seed per pot of fertilized soil and place in a warm area (18-24°C) until sprouting. After 3-4 weeks, you can replant them in bigger pots and place them in a bright area.
Before direct-sowing, make sure the temperature has reached 15°C. Water the soil before sowing the seeds in rows, and water regularly to keep the soil moist at all times. Cover it with a fibre cloth until the plant starts to flourish.