A friend gave this to me one year and I'd love to find it again, but I don't know a name so I can search for it.

I grew it in a fairly large pot in a half barrel water garden. It has white ball blooms and attracted Monarchs in late summer thru Fall.

Here in Michigan it was an annual.

If anyone is interested, I think I finally identified it.

Water Snowball (Gymnocoronis spilanthoides)

https://www.fws.gov/fisheries/...