RHS Classification System
For horticultural purposes, all Narcissus cultivars are split into 13 divisions by the Royal Horticultural Society, based partly upon flower form and partly upon genetic background. Growers register new daffodil cultivars by name and color with the Royal Horticultural Society, with more than 27,000 names registered as of 2008. Registered daffodils are given a division number and colour code.
Read more about this topic: Narcissus (plant)
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