I love all Verbenas, Nicola. You have an amazing collection of plants there!
Better still, you can do wonders with the plants you have in pots

. That one looks real good.
Heres an article about Verbenas:
http://www.telegraph.co.uk/gardening/3394800/Sarah-Raven-on-Verbenas-Autumn-lights.html
You'll see that Verbena venosa is a synonym of Verbena rigida (which is in the
Ideas Genie Pro 6 Master Database - now in the background of your program providing predictive text):
Also on display is a magnificent late-season combination of Verbena rigida (syn. V. venosa)
I bought one of these a few years ago. Ive been struggliong to keep it alive!
I have to dig it up frequently, pot it up and give it TLC to get it to recover.
Note also (same article):
We may have rather overdone our enthusiasm for the tall, thin Verbena bonariensis
This one now self seeds around my garden! It is now in the strawberry patch. I'm not complaining

. Its not a vigorous self seeder here at any rate. If they did they would make nice cut flowers as seen in the photo in the above article.