Care to plant a very fast growing, annual vine that is not invasive? How about one that makes nice purple flowers followed by deep purple decorative pods? Look no further than the hyacinth bean, or the Dolichos lablab as it is referred to by horticulturalists. I planted these in four different places in my yard a few weeks ago and they are all coming up well. My intentions are for it to cover some unsightly areas of my fence and a column on my front patio. It's an old time plant that will cover a nice area in just one summer of growth. Virtually every part of this plant is edible, though you need to take special precautions when cooking the dried beans. However, it is mostly grown as an ornamental in the US. Plant it in poor soil because it is known as a nitrogen fixer just like alfalfa and clover and will enrich the soil for other plants next year. It's also very easy to save seeds for next year off of this wonderful vine. By the way, it is perennial in frost free areas, but will not come back except from seeds in any area that gets frost. Use it as a substitute for morning glories if you want something that is far less invasive and won't keep coming back for years.
I've added to this post a picture of a mature plant off the Floridata web site.