If your passionflowers (Passiflora incarnata) are wilting, you are probably not caring for them properly. Also known as the maypop and apricot vine, the passionflower is a deciduous vine that grows best in warm regions.
Your passionflower may be wilting because you are growing it in the wrong region. Passionflowers grow best in U.S. Department of Agriculture plant hardiness zones 6 through 9, according to the Floridata website. Extreme temperatures can cause it to wilt.
Passionflowers wilt if they do not receive the right amount of sunlight. They need full to partial sunlight to grow properly. If you plant passionflowers in the shade, the flowers will wilt or not bloom at all.
Like all plants, the passionflower needs the proper amount of water to grow and stay healthy. Passionflowers prefer evenly moist soil. If you water them too much or too little, the flowers will wilt.