I started googling just now and haven'tseen anything specifically about its pollen but did see a comment that says it is a sterile triploid that does not set seed. So....
However, unlike other dl, it can grow from a root segment with no crown, and apparently will choke out other dls. (Realize Frillylily already warned about that, but somehow this sounded more dire!)
Oops.
I have definitely seen it sprout up in an area where I believed I'd removed it all, and I can see a problem in the future where I had intended to leave some, and planted the hybrids in front. Right now, I know which is which, but once Fulva var. Fulva starts to multiply or the others do, I won't know! Eek. Maybe I need to rethink this bed I have going. Hmmm!