Plant vigor
Based on plant width and height 3-4 weeks after sowing
Legend:
Non-vigorous (height less than 37 cm and widht less than 75 cm)
Intermediate (height greater than 37 cm 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)