A cultivar of unidentified parentage, this plant was registered by Danny Van Eechaute of Belgium in 2004. It forms a medium size (13 inches high by 37 inches wide) plant with leaves that ripple slightly. In mid-August it begins to bloom with pale lavender flowers followed by viable seeds.

From the Field Guide to Hostas by Mark Zilis (2014), "The powdery blue foliage of 'Flemish Sky' ranks among the best."

The New Encyclopedia of Hostas by Diana Grenfell (2009) states: "Best grown in a container set in front of a red brick wall for color contrast and where the exquisite beauty of the leaves can be seen close up...The leaves appear almost pale gray due to the exceptionally thick pruinose coating, especially heavy on the reverse which, due to the leaf shape, is often visible. Leaf tip is very long."