Trumpet vines, native plants

Trumpet vines, native plants

Question 1: What are people's opinions about trumpet vines as a way to up the privacy of a chainlink fence? Somewhere in the back of my mind, I have them labeled as a plant that will take over the world and therefore shouldn't be encouraged. Is this true? And do they stay green in the winter (I'm in zone 7b, northeast Texas)? Question 2: Barring that, any other suggestions for good privacy plants that are A) hopefully flowering, B) stay attractive year-round, and C) good in black clay soil? Question 3: My garden has ended up a mostly clean slate due to the death of my rosemary plants after the great flood of '07 (a month in which it rained every day, *in Texas*. When does this ever happen?). I have a triangular garden that's probably 10x20-ish, so I need some fairly large plants to take up the space. There are currently two sage plants and three clumps of irises. I'd like to fill in the rest of the space with attractive plants, and I like the idea of using native plants as much as possible. However, I'm clueless as to how I figure out what's a native plant. I'm sure it should be obvious, but obviously not to me. Any suggestions?
Lilac problem

Lilac problem

Conjoined tomatoes, and fuzzy soybeans

Conjoined tomatoes, and fuzzy soybeans

garden boxes

garden boxes

Mini Rose Plant

Mini Rose Plant

My jumbled garden

My jumbled garden

Babies!

Babies!