Growing Verbena, Canadian vervain, rose mock vervain in a vertical garden

There are over 250 species of verbena to pick from, but species such as Canadian
vervain suit vertical gardens for their mounding and floriferous habits since other
species may be less herbaceous and more upright. They are also easy to grow, heatand drought tolerant. To stay bushy and flowering, Canadian vervain really needs to
grow in full sun. It also likes a neutral to acidic pH and particularly well-drained media.