Reeksa roots were necessary for the production of the Blue Shadow Virus antidote. Obi-Wan Kenobi and Anakin Skywalker traveled to Iego to retrieve it. While digging it up, the plant attacked the two Jedi, but after severing two attacking heads, the pair managed to escape.
Behind the scenes
It should be noted that after several of the plant's "heads" are cut off, they are seen to continue to bite as they fall.