Passiflora lutea is a small native perennial vine of the central and eastern United States. It produces small, yellowish-green, fringed flowers in summer, followed by dark purple-black fruit in fall. Its primary garden value is ecological: it is the larval host plant for Gulf Fritillary, Zebra Longwing, and Variegated Fritillary butterflies, and its fruit feed birds and small mammals.
The vine climbs by tendrils to 6–15 feet and tolerates considerably more shade than most other passionflowers, making it well suited to woodland edges and naturalized understory plantings. It spreads slowly by rhizomes and occasionally self-seeds. In zone 6, stems die back to the ground in winter and re-emerge reliably each spring. Consistent soil moisture is essential; the vine declines quickly in drought. A layer of mulch over the root zone helps retain moisture and moderate soil temperature.
Ecoregions:Eastern Temperate ForestsGreat Plains
These dates are for Zone 6b. Enter your ZIP to time every job to your own frost dates.
- watch · Any time in fallMonitor fruit as it transitions from green to near-black; leave in place for birds through autumn.
- plant · Apr 24Plant nursery stock or rooted cuttings in moist, partly shaded ground after the last frost date.
- cut · Any time in springRemove dead overwintered stems to ground level before new growth emerges in early spring.
- cut · Any time in springAttach new shoots to a trellis, fence, or nearby shrub; the vine climbs by tendrils but benefits from early guidance.
- watch · Any time in summerInspect foliage for Gulf Fritillary, Zebra Longwing, and Variegated Fritillary caterpillars; these are host-plant feeders and should remain undisturbed.
- watch · Any time in summerWater during extended dry spells; this vine is adapted to consistently moist conditions and will decline quickly under drought stress.
Problems & troubleshooting
Common problems
Fungal leaf spot
Brown or purplish spots on the leaves, often ringed with a yellow halo, that spread and merge in warm, humid, or wet weather; heavily spotted leaves yellow and drop early.
Pick off spotted leaves and clear fallen debris to remove overwintering spores. Improve air circulation by thinning, and water at the base so foliage dries quickly. If it persists, apply a copper- or sulfur-based fungicide at the first sign.
Root rot
Plants wilt, yellow, and stunt even in moist soil; lower stems and roots turn brown, soft, and mushy and the plant may collapse. Most common in heavy, wet, or poorly drained ground.
Improve drainage and stop overwatering, and never plant too deep. Lift and destroy badly affected plants along with the soil around the roots. Grow in raised or free-draining beds to prevent it returning.