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Passionflower at a Glance
Passiflora incarnata is a climbing vine in the Passifloraceae family native to the southeastern United States. The flowering aerial parts are the principal herbal material.
Traditional Use
Passionflower has a long reputation in Western herbalism for nervous tension, restlessness and sleep support.
Research
Small clinical studies have explored passionflower for anxiety-related symptoms and sleep, including in specific medical settings. Evidence is encouraging but limited by small studies and variable preparations.
Preparation
Dried aerial parts are used as tea, tincture and extracts. Standardized concentrated products are not necessarily equivalent to household tea.
Safety
Drowsiness, dizziness or confusion can occur, especially with concentrated products. Passionflower may add to the effects of sedatives, sleep medicines or alcohol. Pregnancy is generally avoided because of insufficient safety data and historical uterine concerns. People who need to drive or operate machinery should know how a product affects them first.
Folklore and Name
The unusual flower inspired Christian symbolism among Spanish missionaries, giving rise to the name “passion flower.”
Bottom Line
Passionflower is a traditional calming herb with some human research but limited evidence. Sedation and pregnancy are the key practical cautions. For educational purposes only.