i can’t believe i just caught this.
we don’t know the color of the flower in the diner scene, but i have a feeling this isn’t unintentional or a coincidence? grindelwald probably knew of Oscar Wilde, especially because he was in Britain in the late 1890s. Or maybe i’ve read too many Dumbledore/Grindelwald fics that keep referencing Wilde, young Albus and Gellert reading his works…
But seriously, JKR isn’t a stranger to flower symbolism. She’s named characters Fleur/Petunia/Lily/Narcissa, with Petunia being associated with anger/resentment and that one moment in PS where Snape asks Harry about asphodel and wormwood.