Which of these flowers is NOT listed among the common nectar sources that rival or surpass milkweed attraction for Eastern Tiger Swallowtails?
Answer
Aspen leaves
Joe Pye Weed, Blazing Star, and Honeysuckle are explicitly listed as common nectar sources that rival or surpass milkweed attraction; Aspen leaves are a larval host plant for the Western variety.

Related Questions
Do adult Tiger Swallowtails consume nectar from milkweed flowers?What is the fundamental difference between the Monarch and Tiger Swallowtail regarding milkweed as a host plant?What characterizes the larval diet of the Western Tiger Swallowtail?What known host plants are required by the Eastern Tiger Swallowtail caterpillar?How does the general feeding preference of adult Tiger Swallowtails differ from their highly specialized larval needs?If a gardener's primary goal is Monarch conservation, what should dominate a specific area of their yard?When observing an adult Tiger Swallowtail on milkweed, what is the primary biological purpose of this interaction?Which of these flowers is NOT listed among the common nectar sources that rival or surpass milkweed attraction for Eastern Tiger Swallowtails?Why might a large butterfly like the Tiger Swallowtail prefer flowers such as Coneflower or Joe Pye Weed over milkweed for prolonged feeding?What is the recommended garden strategy for maximizing the total variety of adult butterflies, including Tiger Swallowtails?