The hundred seed weight (a, d), harvest index (b, e), and seed yield (c, f) for the 2020/2021 (a–c) and 2021/2022 (d–f) austral summer seasons at the Pretoria site. The same letter(s) on top of error bars indicate no significant differences between planting dates using Tukey’s honestly significant difference with P = 0.05; error bars represent standard error, and n = 3 per planting date.