Giant autumnal blooms.
A bit of googling, and I have discovered it’s a Brugmansia spp.
Brugmansia, WikiPee says, is no ordinary, ho-hum showy landscaping plant.
Native to South America. Words in the entry include alkaloids, hallucinogen, and poisonous.
They’re in the Solanaceae family, and so related to Datura, nightshade (belladonna), tobacco, and mandrake. Geeze.