A vibrational seed-double eliminator (“VSDE”) for a seeding machine that moves seed along a seed path from a seed pool to a release position and a related planting unit are described. The VSDE may include a vibration strip extending along the seed path along the seed pool. As the seed is moved by the seeding machine along the seed path, the vibration strip may cause the seed to vibrate, thereby removing from the seed path one or more seeds from a seed double. The vibration strip may include a plurality of protrusions extending into the seed path, including rounded, cylindrical or other protrusions. The vibration strip may include various parallel ridges extending into the seed path, or a various recesses extending into the vibration strip and away from the seed path. An automated vibration device may impart vibrational motion to the vibration strip.
