I'm sure Gulf Fritillary butterflies like different types of plants, but, what I am familiar seeing is their attack on passion vines. When we had vines in the backyard, we would see activity from May to November. Caterpillars would consume every leaf on the vine. While the caterpillars did their transformation to butterflies, the passion vine leaves would recover. Then, the cycle started again. Usually, about six months of activity in the Bakersfield, California climate.