Along with pink Cadillacs, pink grapefruit, and Pink Floyd, Pink-Cupped daffodils are a 20th century invention. Pink-Cupped Narcissus are versatile, working equally well in the border, in pots and for competition. Pink cups can be the most charming of all.
Pink cups have the reputation to be more susceptible to water damage than the average daffodil. If this is true, giving them a home in a well drained place or in soil that is short on organic material and long on sand and gravel should help with their longevity. The pink color of the cup can be variable from place to place, from season to season. Anecdotally we are convinced that cool temperatures from when the bud of a pink cup breaks the ground until it opens helps develop an intense crustacean color. Afternoon shade may be beneficial.
“Or, depending on the number of cold hours at the exact time the red color chemicals are developing in the flower bud, the cups can have a red rim ring one year and the next none at all.” 1
1. vanBeck,Sara Daffodils in American Gardens p256.