Having experienced your problem I found the only way to remove them was to
cut them back & then dig them up; it took a couple of weekends but they are
gone.
cheers
sandra
"Norman" wrote in message
...
Unsure of how to spell the plant name, so apologies there.

If I spray them with Roundup, will this get rid of them?

Any advice on how to eradicate Agapanthers would be most appreciated