Passiflora affinis, commonly known as Texas passionflower, is a climbing vine native to open woodlands, grasslands, and roadsides in Texas and parts of Mexico. It can reach lengths of up to 6 meters and is characterized by its twining tendrils and deep green, three-lobed leaves. The Texas passionflower produces intricate, dark purple to nearly black flowers about 2-3 inches in diameter from mid-summer to early fall. The flowers are highly showy with a unique structure that includes a ring of filaments surrounding the central reproductive parts, making them attractive to pollinators and gardeners alike.

Texas passionflower is valued for its striking flowers and its role as a host plant for butterfly larvae, including the Gulf Fritillary. It is often used in butterfly gardens, on trellises, and as a naturalizing element in informal garden settings. This vine thrives in full sun to partial shade and prefers well-drained soil, although it is tolerant of a range of soil types. It has moderate water requirements and can be drought-tolerant once established. While generally low-maintenance, it can become invasive if not managed properly, spreading through root suckers and seed dispersal. Gardeners should be aware of its potential to overtake nearby plantings.CC BY-SA 4.0