Buddleja davidii is a great option for attracting these winged creatures into your garden. It sends off long clusters of flowers that are incredibly attractive to many varieties of butterflies, including Monarchs.
Asclepias, or Milkweed, is one of the most commonly known plants that acts as a magnet for butterflies. In fact, it's essential for the survival of Monarch butterflies as it serves as a food source for their larva.
Echinacea purpurea, or Coneflower, is a perennial that produces daisy-like flowers with a large cone-shaped center. You'll find that butterflies flock to this plant as will bees and other pollinators.
Throughout neighborhoods in the southwest, you can't go far without seeing Lantana camara. This heat and sun-loving plant produces clusters of small, colorful flowers.