While monarch butterflies steal the spotlight with their epic migration, the American lady butterfly (Vanessa virginiensis) also graces summer gardens across North America. These lovely visitors aren’t specialists like monarchs, but their caterpillars rely on a short list of host plants—many of which are attractive perennials that both gardeners and caterpillars can enjoy. Let’s explore how to welcome these butterflies into your landscape.
In northern regions, the first adults arrive from the south in late May or early June; southern populations become active earlier. With two to three generations in the north and three to four in the south, adults can be seen from spring through late August or early September in the north, and year-round in Florida and Mississippi.
American lady butterflies forage on flowers for nectar in late spring and summer, inadvertently carrying pollen between blooms and aiding plant pollination.
American ladies are easily confused with their close relative, the painted lady (V. cardui). Key differences: American ladies have orange interior fore- and hindwings with four spots at the base of each hindwing, at least two of which have light blue centers. On the outside of the hindwing, they display two large eyespots, whereas painted ladies have four small ones.
Larvae vary in color—some black, others rusty red—but all share sharp spines and white spots on the second through eighth segments. As they feed, they create a shelter by tying leaf margins together with silk.
Avoid insecticides, especially on flowering plants and larval host plants.
Caterpillars feed on cudweed (Pseudognaphalium spp.), pussytoes (Antennaria spp.), western pearly everlasting (Anaphalis margaritacea), and the annual curry plant (Helichrysum angustifolium).
Plant a succession of flowering plants to provide nectar throughout the growing season.
American ladies are migratory. Spring adults from the south fly north to the upper Midwest, southern Canada, and the Northeast. Females lay eggs on host plants; the first generation of caterpillars emerges in mid-to-late June. After pupating, first-generation adults appear in late June and July, producing a second generation. It’s unclear whether these adults migrate south in late summer or perish in the cold, but northern populations are replenished each spring by new migrants from the south.
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