I know it's not brush but PVC works the best, it lasts for ever and you don't get hung up as much. I like willow and try to find willow in the area I'm going to put the piles so I don't have to transport the materials to the lake.
GoodLuck

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TacoBender
On The Spot Guide Service
"Catchin Crappie Year Round"
www.onthespotwithscott.com