The Day of the Triffids (1963) on Netflix

Inspired by the 1951 novel by John Wyndham, the movie opens with a shot of an idyllic pond and botanical garden. A narrator tells us, "In nature's scheme of things there are certain plants which are carnivorous, or eating plants. The Venus Fly Trap is one of the best known of these plants. A fly, drawn to the plant by a sweet syrup, brushes against trigger bristles. Just how these plants digest their prey has yet to be explained. This is a new comer, triffidus celestus, brought to earth on the meteorites during The Day of the Triffids." Title and credits follow.