Rhizome Barrier Size ?
I have a raised planter along a block wall that divides my yard from my neighbors. I want to plant a clumping bamboo along that wall for privacy. I understand that rhizome barriers really arent necessary for clumping bamboo. My problem is there was some running bamboo that ran under my neighbor's side of the wall (before I bought the house). They are totally paranoid about me planting bamboo. I've reassured them that I will be using a rhizome barrier.
My question is what mil thickness and what height for the rhizome barrier? I want to make absolutely sure this bamboo doesnt pop up on their property.
Thank you so much.