Collin County Chapter

Purple Passionflower – Showy Vine and Gulf Fritillary Larval Host

Provided courtesy of the Trinity Forks Chapter and Dr. Becca Dickstein

Description:

Passiflora incarnata L. is commonly known as Purple Passionflower or Maypop. It is a perennial vine reaching 12-36 ft in height, with glossy, dark-green tri-lobed leaves. In North Texas, expect Passionflower to die back to the ground each winter and sprout from the ground each spring.

Flowers and Seeds:

Purple Passionflower has showy flowers. Blooms are lavender to purple, about five to six inches across, and quite distinctive. Following flowering, three-inch yellow-orange fruit form that have edible pulp. After these dry, seed may be harvested. The blooming season starts in May/June and continues until frost. The genus Passiflora and common names for P. incarnata L. come from its flowers and fruit. The floral parts were said to represent parts of the Christian crucifixion, with the ten petal-like parts representing disciples of Jesus and the other floral parts representing other aspects of the Christian story. Interestingly, Maypop refers to the fruits that pop when crushed.

Planting sites:

Purple Passionflower thrives in partial shade to full sun in a range of soil pH and soil types. It also prefers dry to somewhat moist sites and must be well-drained. It should be planted on or near a structure on which it can climb.

Watering Instructions:

Water Purple Passionflower well when planting it or its seed. It is drought tolerant except in severe dry spells.

Comments:

Purple Passionflower is a must-have for the butterfly garden. It is the preferred larval host for the larva of the Gulf Fritillary butterfly, a three-inch across bright orange butterfly. In a good season, the larva can completely defoliate a Purple Passionflower plant, but don’t worry – the leaves will grow back to support more larva. For this reason, it’s also a great plant for a children’s garden, where children can observe the butterfly larva grow, pupate and undergo metamorphosis to become butterflies.

Purple Passionflower is also a larval host for the Red-banded Hairstreak, Banded Hairstreak, and Variegated Fritillary butterflies. Purple Passionflower is easy to confuse with some of its non-native cousins. Look for the three-lobed leaf shape as an identifier of this particular Passionflower. Passionflowers can spread extensively by root suckers. It is somewhat deer resistant. Consider growing Purple Passionflower instead of invasive non-natives like Japanese Honeysuckle (Lonicera japonica) or one of the exotic Wisteria species (Wisteria floribunda or W. sinensis).

Lastly, seek out the NICE Plant of the Season signs and information sheets on your next visit to a participating North Texas nursery.

About the Region

Fall Symposium 2025 Logo - Teach for the Future

Salado, the location of our Fall 2025 Symposium, lies at the intersection of two ecoregions: the Edwards Plateau (Limestone Cut Plain) and Blackland Prairie (Northern Blackland Prairie).

The Edwards Plateau area is also called the Hill Country; however, this general term covers a much larger area extending farther north. Spring-fed creeks are found throughout the region; deep limestone canyons, rivers, and lakes (reservoirs) are common. Ashe juniper is perhaps the most common woody species found throughout the region. Additional woody species include various species of oak, with live oak (Quercus fusiformis) being the most common. Sycamores (Platanus occidentalis) and bald cypress (Taxodium distichum) border waterways. This area is well known for its spring wildflower displays, though they may be viewed in spring, late summer, and fall, as well. According to Texas Parks and Wildlife, average annual rainfall in the Edwards Plateau ranges from 15 to 34 inches.

The Blackland Prairie extends from the Red River south to San Antonio, bordered on the west by the Edwards Plateau and the Cross Timbers, and on the east by the Post Oak Savannah. Annual rainfall averages 30 to 40 inches, with higher averages to the east. This region is dominated by prairie species. The most common grass species include little bluestem (Schizachyrium scoparium) and Indian grass (Sorghastrum nutans) in the uplands and switchgrass (Panicum virgatum) in the riparian areas and drainages. Common herbaceous flowering plants include salvias, penstemons, and silphiums. This area has suffered greatly from overgrazing and agricultural use. Few intact areas remain, though many of the plants can be found along county roadsides throughout the region.

Our fall Symposium host chapter, the Tonkawa Chapter, includes both of these ecoregions.

Source: Wildflowers of Texas by Michael Eason