I've grown three kinds of pipevine in New Orleans. Aristolochia gigantea, with huge flowers, got sun from early morning to mid afternoon. A. littoralis, the most common sort available, got light shade with several hours of midday sun. A. tomentosa, a native pipevine, got morning sun and in the afternoon deep shade. All 3 thrived! BTW, of these 3, only tomentosa will serve as a host plant for Pipevine Swallowtail caterpillars.