My first encounter with white crinums were from abandoned home where kids played soccer. I saw them blooming one year so I went and dug and dug and finally got some to take home (the field was few homes from my house).
I found wedelia, first encounter with them too. They have been in my yard since 2000 and have mutilplied and been shared with many friends and gardeners.
You can't get rid of them!
Here's my Ellen B. Which I received in a trade and is presently blooming.