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This native plant is named after two polar opposite colored gemstones. "Onyx" refers to its dark foliage and "Pearls" refers to its soft lavender flowers with white interiors. From a distance, the flowers look white!
| Perennial | |
| Penstemon | |
| Beard Tongue | |
| Zone 3 | |
| 6+ hours | |
| Loam, Sandy | |
| 42" | |
| 38-42" | |
| Summer | |
| Lavender, White | |
| Upright | |
| Foliage | |
| Yes | |
| Yes | |
| Yes | |
| Yes | |
| Yes | |
| Echinacea, Achillea, Salvia, Coreopsis |