Principal component analysis for leaf number, plant height, and head diameter for the austral summer 2020/2021 season and 2021/2022 season at the Pretoria site (a and b) and the Potchefstroom site (c and d). Different numbers represent planting dates: 1: November, 2: December, 3: January, 4: February, and 5: March for the Pretoria site. F1 (y-axis) represents the first principal component, with the highest total variance. F2 (x-axis) represents the second principal component, with the second highest total variance. The red lines represent the active variables (leaf number, plant height, and head diameter), and the blue dots indicate the active observations (individual samples per planting date, n = 3).