Chris J Dixon writes
wrote:

it only needs to cover a wall about 8 feet high, and span around 12
feet wide. So not that much foliage, and it seemed perfectly happy at
close of business last year.

I really like Virginia Creepers, but there really aren't any
suitable walls on my present house. How well might one do on a
trellis, obelisk or other structure?

I think it would overwhelm it in a few years. They are capable of
putting out a large number of shoots of 20ft or so in a season.

--
Kay