I've had my trumpet vine for 7 years now, and it's never had a single flower on it. (I was never warned how invasive it was when I ordered it.) It grows huge every year, and the foliage is very healthy. I've read everything I can find and followed every growing instruction, but still no flowers. I'm about ready to try and eradicate it since it takes up a large full sun area that I could be utilizing with something else that would bloom. Any suggestions?