I planted a two culms of P Bissetii back in May in the back patio, in an area about 3'x5', the culms are about 10'tall and growing very healthy, I piled lots of grass clippings covered the area real good... about two weeks ago, I found the bamboo has a shoot that's growing sideways under the mulch but above ground, and removed the mulch, yesterday, I took a close look at the base of the bamboo, and see what I found !!!!

I layed two layers of brick at the end of the area to built up the back and filled it with dirt

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There are three shoots coming out of the brick holes, and in one hole there are TWO small shoots coming out :) you can see it from the picture :)

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What would you do with it in this situation ?