Bloodflower (Asclepia currasavica)
Blue Cardinal Flower (Great Blue Lobelia) (Lobelia siphilitica)
Brazilian Verbena (Verbena bonariensis)
Catnip: I have this pot primarily for the pleasure of cats, but I often see cabbage whites nectaring on it.
Globe Amaranth (Gomphrena globosa)
Heliotrope
Lantana
Marigold
Mint
Mist Flower (Wild Ageratum) (Eupatorium coelestinum):
Radishes: These attract cabbage white butterflies and their caterpillars.
Rue: A host plant for black swallowtail butterflies.