Monarch sightings increase

I talked a lot about creating Monarch habitat earlier this year with some of my neighbors... but none of my milkweed seedlings (the monarch's host plant) survived.
However, we've seen them in the yard each of the past 4 days (compared with just one sighting earlier this summer).

I wonder-- do they wonder why we chase them around with the camera?

And... I don't know what this plant is-- something I found irresistable. All I know is its not frost-tolerant, so it's in a pot, and coddled through the winter, and its particularly happy right now. (Update: I saw one in a nursery today, it's called 'Duranta Repens'-- and apparently in tropical places could get to be 20 feet tall).