| Hosta | Domaine de Courson |
| Status | registered |
| Originator(s) | Ignace van Doorslaer/Diana Grenfell 1996 |
| Origin | 'Sum and Substance' sport |
| Size category | xtra large |
| Plant height x width | 100x150 cm (39x59 in.) |
| Leaf length x width | 46x25 cm (18x10 in.) |
| Vein pairs | 14-15 |
| Leaf color | dark green |
| Variegation | |
| Leaf | shiny |
| Petiole | |
| Scape | |
| Scape height | 115 cm (45 in.) |
| Flower | lavender |
| Flower length | |
| Fragrant | |
| Flowering period | July - August |
| Fertile | |
| Pod | |
| Ploidy | 3-3-3 |
| Patents | |
| Info | A sport of H. 'Lady Isobel Barnett': leaves are very large and dark olive-green topped with lavender flowers. Majestic mid-green leafed form of H. 'Sum and Substance'. Keeps its green colour better in shade. |
| Sports | 'Tropical Thunder' sport/os |
| Progeny | |