We have beautiful, purple morning glories covering a fence at our house right now. The buds curl up and close during the evening and night...
And then open up again in the morning (and throughout the day).
Morning glories are perfect vines for fences and walls as they are low maintenance (lots of sun, little water). They are available in both annual and perennial varieties (generally depending on climate). If you have perennials, just cut the dead vines away after the first frost and they will grow again beautifully the following year.
