Corrupted Whipper Root not cleansing

I'm Currently doing the corrupted whipper root quest where you apply 3 Cenarion plant salves to cleanse the plant. After completing the quest the plant is supposed to vanish and reappear and you can collect it. But after I turn in the quest the corrupted plant doesn't leave. Need help, ty

i have also been trying to do this but have had no success did you manage to find a way to obtain them?. if not i have place a bug report in the bug tracker section give it a vote up and hope they fix it eventually