Abstract: A seed tube having a front wall defining a portion of a seed pathway therethrough and having a concave interior surface having a first radius of curvature. The concave surface may extend only partially across the width of the front wall, such that a portion of the front wall lacks a substantially concave surface. Alternatively, the entirely of the front wall defining a portion of the seed pathway may have a concave surface. In this embodiment, the front wall has an asymmetrical cross-section. For example, a first portion of the concave surface may have a first radius of curvature and a second portion of the concave surface may have a second radius of curvature, with the second radius of curvature being greater than the first radius of curvature.