How do I control my Borinda fungosa?
About 5-6 years ago, I planted three modest clumps of this bamboo. Now they're beginning to scare me with their spread! The largest clump is now about 4'x4' or more in diameter and threatening to topple the two-high cement block retaining wall it is expanding toward.
What can I do to inhibit/halt the spread of this bamboo? I read somewhere that clumpers are immensely powerful in their expansion and hard to contain. I hope their is a solution besides digging.