'True Blue' produces substantial, true cobalt-blue, 2" flowers that bloom from mid-July into fall amid uniquely glossy foliage that is arranged oppositely along thick upright stems.
| Perennial | |
| Gentiana | |
| Gentian | |
| Zone 4 | |
| 6+ hours | |
| Moist, Sandy | |
| Plant with Sedum and Sagina | |
| Combine with Artemisia and Veronica | |
| 15-18" | |
| 12-14" | |
| Fall, Summer | |
| Blue | |
| Moderate | |
| Mound, Upright | |
| Flower-tone | |
| Sedum, Sagina, Artemisia, Veronica |