[1][2] For horticultural purposes, all Narcissus cultivars are split into 13 divisions, as described by Kington (1998),[3] for the RHS,[4] based partly upon flower form (shape and length of corona – the "trumpet" or "cup"), particularly the ratio of corona to length of perianth segments (tepals or "petals"), the number of flowers per stem, flowering period and partly upon the genetic background.
Over 140 narcissus cultivars have gained the Royal Horticultural Society's Award of Garden Merit.
Prevalent colours are all shades and tones of yellow, white, orange, pink, red and green.
Pinks vary from apricot to rose in shades from pale to deep, and some more recent cultivars have hints of lavender or lilac.
However, breeders are currently working against the genus' natural pigmentation and genetic barriers to create cultivars in which pink, rose, red, orange and green tones suffuse or "bleed" from the more highly coloured coronas onto the perianth segments of white or yellow.