For most hostas, height & width are similar dimensions, vase shaped or upright hostas have more height than width, broad/open shaped are wider than taller

Giant: Height greater than 30"                                                 Medium: Height 13" to 18"

Very Large: Nearly giant size                                                  Small: Height 7" to 12"

Large: Height 23" to 30"                                                          Dwarf: Height 3" to 6"

Medium Large: Height 19" to 22"                                             Miniature: Height 3" or less