Plant vigour
Based on plant width and height 3 – 4 weeks after sowing
Legend:
Non–vigorous height less than 37 cm and width less than 75 cm
Intermediate (height greater than 37cm or width greater than 75 cm
Vigorous height greater than 37 cm and width greater than 75 cm
Very vigorous height greater than 50 cm and width greater than 1 m