Many Wirral gardens are bounded by high sandstone walls or thick hedges. They are handsome, but they hide what grows on the other side, and knotweed can sit unnoticed for years before it pushes through at the base.
The signs
Red-purple shoots at the foot of a wall in spring, a stand of tall canes above the wall line in summer, or dry brown canes in winter.
What to do
Leave it, take a photo and send it to us. If it is knotweed, the survey shows how far it runs under your garden and into the neighbours'.