Bitter Dock Posted on July 4, 2012 by Axie A common tall weed, but it’s interesting to see upclose the little white fruits. They can turn red in the sun. The taproot can be 5 feet long. Native to Europe. Bitter Dock (Rumex obtusifolia) 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)