Passionflower

Passionflower is a fast-growing tendril-climbing vine in the genus Passiflora, which contains over 500 species native chiefly to the Americas. The species most associated with the herbal name is Passiflora incarnata, the purple passionflower or maypop, native to the southeastern United States.

Its flowers are among the most architecturally complex of any plant, with a ring of thread-like filaments (the corona) sitting atop ten tepals and surrounding prominent reproductive structures. Spanish missionaries saw in this structure a symbol of the Passion of Christ, giving the plant its common name.

Beyond ornament, the dried aerial parts are a well-known traditional remedy for anxiety and insomnia, and the genus also includes the commercial passion fruit (Passiflora edulis).

• Flowers: 5-8 cm wide, with a striking fringed corona of purple, blue and white filaments above ten pale tepals; central column bears three styles and five stamens
• Leaves: alternate, deeply three- to five-lobed, finely toothed, deep green
• Habit: herbaceous to woody perennial vine climbing by axillary tendrils, reaching 4-6 m
• Fruit: egg-shaped green berry (the "maypop") ripening to yellow, filled with seeds in sweet pulp
• Stems: slender, sometimes dying back to the root in cold winters

Light: Best flowering in full sun, though it tolerates partial shade.

Water: Keep soil evenly moist during active growth; established plants tolerate short dry spells.

Soil: Well-drained, moderately fertile loam; tolerates a range of pH.

Temperature: P. incarnata is root-hardy to about -15°C (USDA zone 6) and resprouts in spring; tropical species need frost protection.

Feeding: A light balanced feed in spring supports growth; avoid excess nitrogen, which favors leaves over flowers.

Propagation: Sow scarified seed, take softwood cuttings, or divide root suckers. Provide a trellis, arch or fence for support.

Passiflora incarnata is native to the southeastern and south-central United States, from Texas and Florida north to Pennsylvania, where it grows in sunny disturbed ground, field edges, roadsides and thickets.

The broader genus is concentrated in tropical and subtropical America, with a few species in Asia and Australasia. Passionflowers are now cultivated worldwide as ornamental vines and, in warm regions, as fruit crops.

Ornamental: Widely grown to cover trellises, pergolas and fences with its exotic blooms.

Medicinal: The dried flowering tops are a long-standing herbal remedy for restlessness, mild anxiety and insomnia, often taken as tea or tincture.

Culinary: The ripe maypop fruit has edible sweet pulp; P. edulis is the source of commercial passion fruit.

Ecological: Flowers attract bees, butterflies and hummingbirds, and the foliage is a larval host for Gulf fritillary and other butterflies.