Passion Vine: A Flower That Hardly Looks Real

• Sep 14, 2026
• by Rebecca Auchter

Some flowers are beautiful. Some are unusual. And then there are passion flowers.

The flowers of Passion Vine look almost too complicated to be real. With intricate layers, delicate filaments, and unusual shapes, they look more like something from a tropical fantasy than something growing in your backyard. Take a close look at one and you may find yourself wondering how a flower could possibly develop all those details naturally.  But it does—and the Passion Vine we carry, Passiflora caerulea, can grow right here in Pittsburgh.

Passion Vine is a vigorous climbing plant that can cover a trellis, fence, arbor, or other support with lush foliage and fascinating flowers. In Pittsburgh, we are in USDA Hardiness Zone 7, and Passiflora caerulea can tolerate our winters. It may die back to the ground during particularly cold winters, but it can return from its roots in spring.

Growing Passion Vine in Pittsburgh

Passion Vine grows best in full sun, ideally with at least six hours of direct sunlight each day. A sunny location will encourage the best growth and flowering.  Give your vine something sturdy to climb. A trellis, fence, arbor, or other support works well. Passion Vine is vigorous, and once established, it can grow quickly. Under good conditions, you can expect it to reach approximately 15–20 feet tall and 6–8 feet wide, although its size can be managed with pruning. Good drainage is important. Passion Vine likes consistent moisture, particularly while it is becoming established, but it does not like sitting in soggy soil. Water deeply after planting and continue watering regularly during dry periods.

Be Patient in Spring

One of the most important things to remember when growing passion vine in Pittsburgh is to be patient in spring. If winter has killed back the above-ground stems, don’t assume your plant is gone. Passiflora caerulea can die back and then send up fresh growth from the roots once the weather warms. You can cut away the dead stems in spring when you see new growth emerging from the base. Once established, Passion Vine can become a vigorous and exciting addition to the garden.

And then there are the flowers.

Give this vine sunshine, something to climb, and a little patience, and you’ll be rewarded with flowers that look almost too strange and beautiful to be real. But they are—and they can grow right here in Pittsburgh.