Hand seeders can greatly reduce your time sowing flats over hand seeding. Vacuum hand seeders allow you to quickly pick up and place individual seeds into each plug cell. This reduces the number of seeds that are double sown, resulting in an increase in the number of plants. An even faster way to sow your plug flats is with a vibrating seeder. A vibrating seeder delivers a steady flow of seeds allowing you to move the seeder over each cell of your plug tray, quickly filling each cell.