Bittersweet, and probably the invasive oriental species, Celastrus orbiculatus. When you pull up roots, you will notice they are orange in color. Here is a link that might be useful: Celastrus orbiculatus

Given the two choices, I'd take the Bignonia over the Campsis any day. More likely to retain foliage here (should be mostly evergreen in all but the worst of our winters) and far less aggressive. Earlier in my gardening career, I planted campsis for my hummers and have spent the years since regretting it. It suckers madly, sending up shoots at considerable distance from the mother plant and was nearly impossible to eradicate. Was also quite messy on my patio, dropping a ton of spent flowers (which rapidly turn to mush), followed by the leaves in fall. And needed a lot of pruning to keep in control and present any sort of tidy appearance - a wild and unruly plant. But the hummers loved it! I'd also suggest you reconsider a honeysuckle. Proper selection and siting should reduce the aphid problem. I have several, including a couple of periclymenums (aka woodbine), 'Serotina' and 'Graham Thomas', both of which are very fragrant and nearly nonstop summer bloomers for me and with no aphid problems. (btw, hummers like aphids almost as much as they like nectar!) The only issue I ever had with aphids on honeysuckle was with a purpleleafed form that was planted in too much shade. I'd also urge you to try a trumpet honeysuckle - Lonicera sempervirens 'Mandarin' is a good choice with dark red-orange, trumpet-shaped flowers all summer. No fragrance, though. Another interesting and less common choice would be Fuchsia regia, a climbing/vining type of hardy fuchsia. May not cover an arbor and like climbing roses, needs some help with attachment, but is great sprawling though other, larger shrubs. Typically available in summer at larger Puget Sound area nurseries. And I am surprised with your concerns about hardiness - here in zone 8 we don't have too many worries in that regard.

"Weeds" are simply plants you do not want growing where you do not want them and many are wild flowers that readily self seed and can be spread by birds. To keep this unwanted plant growth out of you lawn you need to grow a vigorous and healthy turf that is thick so any "weed" seeds that may get there cannot find the conditions they need to germinate. Mow the grass as high as possible which will aid in shading the soil so any "weed" seeds there do not get access to sunlight. Water when necessary, there are indications that the short time daily watering is more conducive to "weed" seeds germinating then watering only as needed would be.

I agree with Roxy. I have one, too, and it is eating my house. It has root in a crack in my back patio and up it went to the roof of our two-story home. I think it was awesome in many respects. It never needs water even in areas that are in full drought and do not supplement with water. I could not believe this thing. I had a black thumb back then, and even I didn't kill this thing. It makes a great, very quick screen if you want to grow it for covering an ugly fence or what have you. I don't know what you mean, though, that you asked for tips and never got your question answered as that seems like exactly what you were given.... tons of tips... LOL... although my big tip is that this plant doesn't need tips to grow. I dare you to try to kill it after planting it directly in the ground where you want it. Honestly, plant it, water occasionally or not, and this thing will grow and grow well. ~Angela