clematis?

does it have to be perennial? I love my morning glory vines on my arbor. Can change the colors each year or plant 2 colors together like I did last year. They grow so fast, they would fill it for summer

-Clematis with climbing roses.
-Golden hops
-Honeysuckle

I would agree with Clematis. They come in a big variety of colors and 3 blooming times. Also a variety of flower shapes, bells, doubles, flat daisy types. You could have something going all season! They do better with pruning, which will depend on bloom times. They can grow tremendously in a season, as the plant gets older over the years. It can take a couple years to get them going and lush. Except for the pruning, a little direction for the growing stems, clematis are very easy plants. They are very friendly to other plants, easy to make a border in front of them.

For annuals, the morning glories are a good suggestion, lots of colors. They do reseed themselves, you often don't ever need to plant again. Moonflowers are a night bloomer, same trumpet-shape flower. Hyacinth Beans are a newer vine, popular around here. Grows to a great size in just the summer. Flowers pretty steadily all season.

There are a number of other good annual climbers, lots of colors to fit a scheme. You could plant some from the seeds, see what you like to plant again. Perhaps mix the planting, let annuals fill in while perennials grow and increase in size.

I love my Clematis Piniculata.(Sweet Autumn Clematis). It grows very tall and will spread out. It blooms in August with lovely white blossoms and they smell heavenly. Since it is a perennial it comes up every year. I think if you check it out you will like it.

It takes awhile to get established but what about hydrangea petiolaris? When I think pergola, I think big. The large flowered clematis I don't think grow that tall. The sweet autumn sure does.

Here is a link that might be useful: Climbing hydrangea

I would look at Kentucky Wisteria. If you want year round interest once established.