large to giant hosta (hybrid of hosta nigrescens) 'krossa regal'

hosta nigrescens sieboldiana krossa regal attractive beautiful blue botanical botany bright close closeup cultivar details flora foliage garden gardening geometrical giant gray green growing hostaceae hybrid large leaf leaves lilies macro margins nature ornamental perennial plant plantain lily shady smooth summer sunlight thick veined wavy woodland 'krossa regal' widely-veined hav