It works like the other effects that remove ground effects like Ganban does - shreds pneuma, ME, bard/dancer songs, SW, etc - it removes almost everything.
It is most important in WoE, but it's also part of your job in Bio4 (depending on how good the sorc is, if you have one) for removing pneumas. It sounds useful in MVPing, but I rarely found it so.
The way the skill works is weird, too - when you cast it, it places the listed number of vines throughout the area of effect at random, and in very rapid succession. As these are placed, they deal damage and remove effects in 3x3 squares.