 | Hosta
'Hapsden Blue' |
| Herbaceous Flowers, Container-friendly, Rounded - Clump | Dark blue flowers (Summer), Blue foliage |
 | Hosta seiboldiana
'Francis Williams'
Plantain Lily |
| Herbaceous Flowers, Ground cover, Container-friendly, Rounded - Clump | Dark blue flowers (Summer), Blue foliage |
 | Hosta fortunei
'Aurea'
Plantain Lily |
| Herbaceous Flowers, Ground cover, Container-friendly, Rounded - Clump | Dark blue flowers (Summer), Golden foliage |
 | Delphinium
'Black Knight' |
| Herbaceous Flowers, Container-friendly, Rounded - Clump | Dark blue flowers (Summer late), Medium Green foliage |
 | Delphinium
'Summer Skies' |
| Herbaceous Flowers, Container-friendly, Rounded - Clump | Dark blue flowers (Summer late), Medium Green foliage |
 | Viola
'Ardross Gem'
Violet |
| Herbaceous Flowers, Container-friendly, Annual, Rounded - Clump | Dark blue flowers (Winter), Medium Green foliage |
 | Agapanthus africanus |
| Herbaceous Flowers, Container-friendly, Spikey | Dark blue flowers (Summer), Medium Green foliage |
 | Agapanthus Midnight Blue |
| Herbaceous Flowers, Container-friendly, Spikey | Dark blue flowers (Summer), Medium Green foliage |
 | Agapanthus
'Sybil Harton' |
| Herbaceous Flowers, Container-friendly, Spikey | Dark blue flowers (Summer), Medium Green foliage |
 | Agapanthus Kingstone Blue |
| Herbaceous Flowers, Container-friendly, Spikey | Dark blue flowers (Summer), Medium Green foliage |