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) Email Click to share on Facebook (Opens in new window) Facebook Click to print (Opens in new window) Print Click to share on Pinterest (Opens in new window) Pinterest