| Hosta | Cool Mistress |
| Status | not registered |
| Originator(s) | Hugo Philips |
| Origin | 'Beatrice' x 'June Fever' |
| Size category | medium |
| Plant height x width | 40x cm (16x in.) |
| Leaf length x width | |
| Vein pairs | 9 |
| Leaf color | blue-green,creamy yellow edge |
| Variegation | edge |
| Leaf | good, a bit wavy |
| Petiole | |
| Scape | |
| Scape height | |
| Flower | |
| Flower length | |
| Fragrant | |
| Flowering period | |
| Fertile | |
| Pod | |
| Ploidy | |
| Patents | |
| Info | Blue leaves with a creamy-yellow margin that turns white. Nice introduction with the noticeable background of 'Tardiana'. |
| Sports | |
| Progeny | |