| Hosta | Cosmic Blue Seas |
| Status | registered |
| Originator(s) | Rod Kuenster 2021 |
| Origin | ('Letha Mae' x 'King Lizard') x 'Stegeman's Dreadnaught' |
| Size category | |
| Plant height x width | 58x124 cm (23x49 in.) |
| Leaf length x width | 29x22 cm (11x9 in.) |
| Vein pairs | 10-12 |
| Leaf color | |
| Variegation | |
| Leaf | |
| Petiole | |
| Scape | blue green |
| Scape height | 76 cm (30 in.) |
| Flower | |
| Flower length | |
| Fragrant | |
| Flowering period | |
| Fertile | |
| Pod | |
| Ploidy | |
| Patents | |
| Info | Nice large blue used by registrant for hybridizing |
| Sports | |
| Progeny | |