To germinate citron seeds, start by soaking them in warm water overnight. Next, plant the seeds in a well-draining potting mix, burying them about 1 inch deep. Keep the soil consistently moist but not waterlogged. Place the pot in a warm location, ideally between 70-85°F (21-29°C), and provide indirect sunlight. With regular watering and patience, the citron seeds should begin to germinate within 2-4 weeks.