Seeds.
While wolves resist Immobilize and slow, wolves do not resist confuse so Seeds of Confusion will work. It is common for confused wolves to run off. Vines and Strangler will hold wolves.
Creepers will work, and if you can stack enough Immobilize with Creepers, Twoey and your Roots, you may be able to Immobilize the wolves after a few shots.
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With two Plant Controllers you should be able to keep any wolves confused, and they actually can be immobilized if you stack enough. If both Plant Controllers spam Roots the wolves should be immobilized pretty quickly, certainly long before the Seeds wear off.
Also, you can always just hold any wolf that gets too close for comfort. Vines works on them just fine. I don't remember them being more than a minor annoyance on my Plant/Storm... but then they like melee and I had Hurricane so that could make a difference. 
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I find them largely just an annoyance in that I have to stand around and wait for them to return to defeat them.
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No H8 - 08.04.10
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Hey everyone,
My Plant troller (this one is /sonic) is getting to the levels that he'll have to face WarWolves, and since it's really difficult to lock them down (immob wise), what really (other then not selecting Radio Mish's that include them) do to keep them off?
Will Seeds work on them or should I just give up? Current Team is a DB/Fire scrapper and two Plants one FF and one Sonic for tons of shielding. I know the Scrapper can survive them since he's capped everywhere, but what I am afraid of is getting their attention LOL.