I dug this out myself, roughly 6 feet in diameter and 4 inches deep. Given how fast everything is growing and self-seeding, I'll be able to expand closer to the street next year.
Southeastern USA Plains. This is the last stop for rainwater before the storm drain leading to the Chesapeake Bay.
Watching them flutter around the milkweed, over to my neighbor's flowers, across the street and back again was beautiful. It was amazing to see one in person. They're much larger than I imagined and very graceful.