This is why you leave 1 -2 inches above ground when you install a bamboo rhizome barrier. Pictured is a rhizome from Phylostachys nigra "Megurochiku" coming up for air and diving right back into the ground. A 30 inch plastic barrier with 1 to 2 inches above ground is an effective way to contain a running bamboo in its intended planting area.Although I do love running bamboo, clumping bamboo is nice because it is non-invasive and does not require containment with rhizome barrier. For me, running bamboo belongs in a pot.
Cheers!
Sean
