The Award of Merit was awarded to Canna 'Roi Humbert' (votes unanimous), submitted for examination by Sir Trevor Lawrence, Bart., K.C.V.O., V.M.H., and Messrs J. Veitch, Chelsea. It was described as being, "A dark-leaved, orchid-flowered variety, with a bold spike of orange-crimson flowers."
This cultivar has been grown in Nantes, France, Parks Department since first introduced, and visitors there cannot fail to be impressed. It is a tall variety, but at Nantes it is grown on a raised bank, so that it has a commanding position over all the surrounding Canna cultivars. Even near the end of a long, hot summer its distinctive foliage is eye-catching. It was bred by Carl Sprenger who declared, "This plant will amaze the horticultural world."
It is now safely in the hands of Canna enthusiasts and should be generally available in a few years time.
Carl Sprenger in Wikipedia