20 Trailer African Violet Seeds. Trailer African Violets are similar to standard violets, only the stems grow longer allowing the plant to trail over the sides of the planters. To plant: Plant in good soilless well-draining potting mix, a seed starter mix is preferrable to provide the nutrients the seeds need. Make sure the soil is moist, not soggy. Sow the seeds on the surface of the soil and cover with plastic(for instance, put a ziploc bag over a nursery pot) to ensure the seeds stay warm and humid. To evenly spread out the seeds, put the seeds on a piece of paper and sprinkle onto the soil. Make sure to monitor the soil to make sure it doesn’t dry out.