Wisteria is a stunning flowering vine that produces cascades of fragrant, lavender, blue, or white flowers. It is a perfect choice for a trellis-covered porch, as its long, hanging blooms will create a dramatic effect. Wisteria vines require a sturdy trellis or pergola to support their heavy growth. They prefer full sun and well-draining soil. While wisteria may take a few years to establish and bloom, the wait is worth it for the breathtaking display it will provide.