| Trait | Narrow-sense heritability |
| Biomass yield | 0.65 (0.17) |
| Mass shoot−1 | 0.56 (0.23) |
| Shoots m−2 | 0.63 (0.19) |
| Plant height | 0.52 (0.26) |
| Crown area | 0.72 (0.24) |
| Internodes shoot−1 | 0.67 (0.26) |