i've been growing verbena bonariensis for a few years and it has become my favourite weed. Last year i bought verbena rigida, verbena bampton, homestead purple (overwintered in a sheltered spot) and seeds of hastata (but it seems that i have been looking after a grassy weed instead).
Rigida didn't make it through the winter. Yesterday i noticed a little seedling nearby, slightly different to bonariensis. Yeah, i get my trowel to dig it up carefully and horror, it comes with a massive nasty looking runner! (Think mint and ground elder ????) It's definitely verbena leaves but it was a bit of a shock to find it popping out a good 40cm away, dangerously close to other plants...
Sooo.... What is the deal with those verbenas, everybody raves about them but if i'm going to introduce a spreading monster, i want to know about it! Bampton seems well behaved so far and i don't know what to think of homestead purple (Spreading overground because it's trailing variety or underground runners?)