Newbie requires help
I have a plant that seems to grow anywhere it wants - brickwalls, concrete, middle of my flower beds! I've attached a picture hopefully someone will be able to recognise it and give me tips on how to remove it. I'm not 100% convinced it is knotweed as the leaves aren't the "normal" heartshaped leaf but it has a hollow stem just like bamboo with red/purple and green leaves. It appeared in my boarders 2 years ago and I remove one and another sprouts up! It is vigirous and grows tall.
Can anyone help? Thank