|Male monarch resting in a mesquite tree photo by Richard Halliburton|
Monarchs are very selective about what species of plant they will lay eggs on, since the caterpillars are adapted to feed almost exclusively on milkweeds. However, the adults will gather nectar from a wide variety of flowers. Even though they are endemic to North America, monarchs are happy to feed on plants imported from the Mediterranean, such as lantana and rosemary, or Australia, such as eucalyptus and wattle trees.
|Female monarch nectaring on a wattle tree|
Photos are excellent documentation too, since it is easy to confuse a monarch with the more abundant and closely related queen and occasional viceroy butterflies that also flutter around these parts. Learn the differences here: Identifying Monarch Butterflies.