Have you looked into Morning Glory's? Just a thought :>)

I have trouble with invasive morning glory (bind weed) from other yards. I don't want to get confused, I pull up every morning glory I see sprouting. But, they do look nice or moon flowers also.

There's loads of annual vines and in your zone some may be perennial. Maybe you could mix some early and later flowering varieties.

I planted these seeds last year in July and it took them forever to start to bloom. The bloom, I saw was not a flower, but some kind of colorless inflorescence. The vine looked like regular sweet pea vine, and it was very thick. It was shading out light to over plants. It also required constant tending tying and restaking. When I look at the seed package picture (see the link below), I was like this is not what I wanted at all. I don't know if the nicer flowers were coming later,(as pictured) but I had to remove the vine. It had all the bad things about sweet peas, but none of the good things as in flowers. I am looking for an annual vine, because I want something fast growing to take out or change every year. My soil is rich and that is part of the problem. It may have been better for a poor dry soil, and then we had an El Nino this spring, so it got too much water.

Here is a link that might be useful: Sweet Pea Perennial Blend Seed

I wish I could fix this now. I meant to say it blocked out light to "other plants", not "over plants". But, it did tower over other plants and blocked the sun light.

Perennial sweet peas can be monsters, especially after a few years. Mine get huge but the blooms are gorgeous. Mine will begin flowering in a couple weeks and will continue until the first freeze. You could try scarlet runner beans, Spanish Flag, cobea scandens, flame vine. There's so many that will grow well in your zone. Many that are annual here might be perennial in your zone.

Thanks for those ideas. I am still confused as to why my perennial sweet peas only had insignificant flowers.

Mine have been in the garden at least 5 years. I can't remember how many blooms they had the first year but it was nothing like it is now. The vines get bigger every season and the flower stalks get longer. It's gotten to the point where I've been cutting them back and even digging some up and mine die back in the winter. I can't imagine how big they might get in a frost free zone. If you give them a couple seasons the blooms really are beautiful but I wish they had a scent like the annual sweet peas.

We did have some kind of freeze last year on Dec. 7, and I lost a bunch of plants, that were not adjusted to colder temps. Although it did not actually freeze, I had death of plants that were supposed to take 20 degrees. I was like 35? I don't really know, but the damages was extensive and across the board on most plants. Once the plants are made to go dormant they can take more cold I guess, because mine were not dormant therefore, they just died.