Although labeled H. 'Coerulea', it appears
that this plant is actually Hosta caerulea forma latifolia
which is synonymous with
Hosta sieboldiana
var.
sieboldiana... is that clear? In the end, I think it means
that it is a big blue hosta of the 'Sieboldiana'-type.
BTW
- Coerulea is a Latin word for blue.