This perennial vine's use as a hummingbird attractant cannot be over emphasized. Hummingbird's adore this plant and may return year after year to it. The Hilton Pond nature center had the following to say about this plant's use in their hummingbird banding efforts: "it is absolutely an amazing attractant for hummingbirds. We maintain a monstrous monoculture of Trumpet Creeper that serves as centerpiece for our hummingbird trapping area".
But I only quoted a portion of the sentence from the Hilton Pond website- the sentence continued with this warning: "but many folks shy away from this magnificent native plant because it grows so rapidly and, coincidentally, because it causes dermatitis in cattle (and some people)--hence the alternate name of "Cow Itch." Indeed, this is a very rapid growing vine. It will take over any structure that it is planted near. Even Wikipedia warns that "ruthless pruning is recommended" with this vine.
Killer Plants website mentions that this plant was highly prized back in the day of outhouses for its ability to quickly and ornamentally (perhaps fragrantly, as well?) help conceal an outhouse.
At the end of its growing season, the Trumpet Vine produces several 6" - 9", bean shaped seed pods that are filled with small, winged seeds. Once the pods are completely dry (sometime during the winter), they will split open and spill their content of winged seeds. And how many seeds are in a pod? I didn't know, so I decided to find out.