| Species/hybrids | Germination [%] | Pollen tube length [µm] | ||
| Mean ± s.d. | Duncan grouping | Mean ± s.d. | Duncan grouping | |
| P. sylvestris | 85.6 ± 3.7 | B | 87.2 ± 33.8 | B |
| P. mugo | 70.6 ± 3.7 | BC | 114.2 ± 47.7 | A |
| Hybrid 1—H1 | 82.3 ± 0.5 | B | 115.2 ± 39.5 | A |
| Hybrid 2—H2 | 91.6 ± 1.5 | A | 109.5 ± 45.8 | A |