10 Passiflora Incarnata Seeds (Purple Passion Flower) Purple passion flower is one of the hardiest and most popular species of passiflora. It is revered for its surreal, sweet-scented flowers, its sugary fruit and its medicinal value. This fast-growing perennial vine can reportedly withstand temperatures as low as -25 degrees Fahrenheit and can be found growing wild in most of the United States west of Texasand south of New York. In frosty areas, the foliage will die back but the roots will remain. This makes incarnata a good grafting stock for other species of passiflora. New growth generally begins again in May, hence the name "maypop". In a single season in good growing conditions, the vine is said to be capable of putting on 20-30 feet of growth. Most growers prune the plants to prevent crowing while also harvesting fresh herb. As an ornamental, it is ideal for decorating structure. The seeds can be collected from the fruits that have fallen from the vine and dried. Be sure to mulch the roots in the fall to protect them from the cold. The flowers are used fresh or dried to make a relaxing tea that is useful for anxiety. Purple passion flower contains at least one MAOI and should not be consumed along with certain foods or drugs.