Blue Vervain Posted on July 16, 2012 by Axie Reply Up to 6 feet tall. Likes a good swamp. Part of a really great wetland restoration project on the Wellesley campus. Native. Vervain family. Blue Vervain, Swamp Verbena (Verbena hastata) Share this:Click to email a link to a friend (Opens in new window)Click to share on Facebook (Opens in new window)Click to print (Opens in new window)Click to share on Pinterest (Opens in new window)