The first sizable Summer traps on my Dionaea have begun to appear in the last couple of weeks; and it is the more obscure Dirk Ventham's Giant (G14) which is taking the current lead at 4.9 cm (1.95"). Other cultivars reach their largest by the Fall . . .
Dionaea muscipula cv. "Dirk Ventham's Giant" (aka "G14")
Dionaea muscipula cv. "Dirk Ventham's Giant" (aka "G14")