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Hello. I'm considering growing Japonica behind a barrier, but a bamboo retailed suggested against it because Japonica rhizomes are deeper than other bamboo and will run under the usual 2.5-3 foot deep bamboo barriers. Have ya'll had similar experiences with Japonica?

They don't tend to run much deeper than other running bamboos. If soil is fertile and loose enough all the way down to bottom of the barrier, they may try to grow under it. But if bottom of barrier is in less fertile and compacted sub soil, they will likely remain near the surface.