My biggest is about a 6yo pink one with silver or grey-green foliage
It gets about 12-16" tall and is about 3and1/2' long by about 10" wide--because it is hindered by rocks on one side and the lawn mower on the other side
the red and orange are about 8" tall and about 18" diameter currently, and then I have another couple youngins that I put in last year that are still quite small.
I've not tried the pinky-purple verbena in soil on purpose, but it does root runners into my positively evil clay soil and survives winters as isolated new plants in my lawn so I'd have to say that it probably could. I've successfully transplanted a few--and killed a few more--trying to relocate them back to the scree in the spring.
