Passionflower is an herbaceous or woody vine that is native to the southeastern or eastern United States. The flowers are wonderfully large, complex, and three-dimensional. The plant prefers full sun, dryish soil, and a trellis. You need to keep it watered and weeded during the first year or two when the plant is getting established. This plant can easily be trained up a sunny wall on the porch to give seasonal shade and a showy floral display. The best germination will be achieved by soaking seeds in warm water for two days, then nicking with a sharp blade and planting in warm conditions. Germination usually occurs within 30 days. Work seedlings up in successively larger pots and plant out at a spacing of at least four feet apart.