unknown plant growing every where-help!
We recently moved to a new house that apeard to have a lot of some type of dead bamboo canes growing in it. I cut to ground level and put round up on stumps, but when spring finally arrived it just started re sprouting with puple/ red buds surfacing from the stumps and it is every where, even drains and cracks on concrete ,even srpouting though a shed I`d put over an area I thought Id cleared . It is like large canes of bamboo with small flowers that haven`t bloomed on the top and grows to over seven foot. Help