I'm not surprised to have no answers. I encourage you to look it up in case you need an annual to replace what the woodchuck ate or the string trimmer took down. It has volume with out too much heft and good chartreuse leaf color. With some luck it may reseed/

In my garden it's filling in some "to be decided" spots. Keeps me from buying "desperation replacements" and half price for beautifully grown Proven Winners also known as Proven Expensive.

https://davesgarden.com/guides/pf/go/166837/#b

Yes, in my zone 6a CT garden it reseeded. Although I liked it in small doses, I had a small patio of field stone set in gravel where it became a problem. If you catch the seedlings early enough in the year, they are easy to yank but they quickly develop a tap root that can make them difficult to remove from patio and walkway cracks.