Well I'm certainly confused!
From a gardening perspective, 'pink' is clearly right for 21a:
https://www.gardenersworld.com/how-to/grow-plants/dianthus-grow-guide/
However it definitely doesn't fit from a literary perspective! Quote:
"Shakespeare uses “pink” four times in his works: in The Taming of the Shrew (c. 1590-1591) to describe a pair of shoes that are un-pinked (undecorated) in the heel (4.1.119); in Romeo and Juliet (c. 1595) for wordplay over Pink the flower and courtesy (2.1.54-55); in Antony and Cleopatra (c. 1606) where reference to Bacchus (the God of wine) with “pink eyen” embellishes a drunken scene and mirrors, perhaps, the squinting eyes of inebriated revellers (2.7.110-11); and in All Is True (Henry VIII), written with John Fletcher (c. 1613), to describe a “pinked porringer”, i.e. a hat decorated with pinks, worn by a haberdasher’s wife (5.2.35-38). None of these references refer to ‘pink the colour’ because this colour term is not generally used as an adjective until at least the middle of the 17th century and, as a sole colour term, must wait for the Restoration of 1660."
Source:
https://journals.openedition.org/erea/4435