 | Allium karataviense
'Ivory Queen'
Alpine Allium |
| Herbaceous Flowers, Ground cover, Spikey | White flowers (Summer early), Blue foliage |
 | Beschorneria yuccoides
Beschorneria |
| Herbaceous Flowers, Container-friendly, Spikey | White flowers (Summer), Blue foliage |
 | Eryngium bourgatii
Sea Holly, Eryngium |
| Herbaceous Flowers, Container-friendly, Spikey | Blue-silver flowers (Summer), Blue foliage |
 | Eryngium giganteum
'Silver Ghost'
Sea Holly, Eryngium |
| Herbaceous Flowers, Container-friendly, Spikey | Blue-silver flowers (Summer), Blue foliage |
 | Eryngium bougatti
'Picos Blue'
Eryngium |
| Herbaceous Flowers, Upright - Clump | Blue-silver flowers (Summer), Blue foliage |
 | Eryngium giganteum
Eryngium |
| Herbaceous Flowers, Container-friendly, Spikey | Blue-silver flowers (Summer), Blue foliage |
 | Cerinthe major
Purpurascens
Honeywort |
| Herbaceous Flowers, Ground cover, Container-friendly, Annual, Spreading clump | Dark blue flowers (Summer), Blue foliage |
 | Nepeta x faassenii
Catmint, Nepeta |
| Herbaceous Flowers, Herbs, Ground cover, Culinary, Spreading arching | Light blue flowers (Summer early, scented), Blue foliage |
 | Nepeta x faassenii
'Six Hills Giant'
Catmint, Nepeta |
| Herbaceous Flowers, Herbs, Culinary, Container-friendly, Spreading | Light blue flowers (Summer, scented), Blue foliage |
 | Hosta halcyon
Plantain Lily |
| Herbaceous Flowers, Ground cover, Container-friendly, Rounded - Clump | White flowers (Summer early), Blue foliage |