Well....I would trteat aas a perennial, until I know differently.
What would you do different if itw ere one or the other?
Linda C

You have a point, Linda! Though maybe if I knew it were annual I'd be spared the pain if it doesn't come back. Perhaps I'd site it differently as well. But you're right, I'll just treat it as a perennial and see what happens.

For me, trailing purple verbena is an annual - as is homestead purple. If you keep the trailing purple verbena deadheaded, it will bloom all summer. I like it in pots.