Passionflower Hardy passionflower is one of the most exotic vines you can grow. It's also one of the best for butterflies as a variety of them drink its nectar. It's a host plant for several types of butterflies, as well. Name: Passiflora incarnata Growing Conditions: Full sun and well-drained soil Size: Climbs to 10 feet Zones: 6-9 Grow it with: Black-eyed Susan vine for a charming blue-and-yellow combo of quick-growing vines. Learn more about growing passionflowers.