I have a large ceramic pot in the corner of my deck - it's in an enclosed area that is covered by a fiberglass material that lets light in-but it does not a lot of light. I've had gladiola bulbs in it for the past couple years and they grow, they just don't bloom. I'm assuming its because there is not enough light. I would like to grow something tall & leafy, possibly flowering, possibly climbing. Don't really care if it goes dormant in the winter - open to suggestions. BTW, I live in Northern California about 5-6 miles from the coast.
Aspidistra elatior (Cast Iron Plant) is great for filling in a large planter. It is non-flowering though and will have to be protected through winter in your zone. Humulus lupulus Hops Vine could do well in that spot if the light it gets is bright enough. Most Ivy's will do well in shady spots but they don't flower. Glads need full sun, 6+ hours a day and hot temperatures to bloom. They will do really well out in the yard.
If your pot has a drainage hole, english ivy is an ideal plant for the beginner who wants to train bonsai. It should be hearty in your zone out of doors. And needs about every other month pruning to train into tree shape(s).