Terraced streets in Pendleton, Ordsall, Weaste and Eccles tend to have small paved yards opening onto shared alleys. Knotweed gets through joints in the paving, along the footing of a wall and under a rear gate.
What you may see
Purple shoots in the paving in spring, a thick clump of canes in a corner by midsummer, or dry brown canes through the winter.
What to do
Leave it, take a photo and send it to us. If it proves to be knotweed, the survey shows how far it runs under your yard and the neighbours'.