A convention of Black-eyed Susans (or is it a herd? A troupe? Or gaggle?)

A convention of Black-eyed Susans (or is it a herd? A troupe? Or gaggle?), originally uploaded by ashapiro515.

When a bunch of Black-eyed Susans come together, what are they called?
A herd...
A troupe...
A gaggle...
A plethora...
An invasion...

My favorite: A cacaphony

I screwed up with this image because there were acres of them and all I shot was this. Musta had stuff on my mind. Damn. This is a mistake I'm not keen on celebrating. (So consider this a cautionary tale)