Within this app are several 'tools' if you are worried that you might have a Japanese Knotweed infestation. Within the identify section are descriptions of the weed at various points of the year, along with close up images of what it looks like at these times.
And if you are worried that you might have an infestation that use the 'Do I Have Japanese Knotweed' button to get in touch with us. You can simply enter a few details so that we can contact you with our opinion, then using your device's camera take a photo of the plant and email that to us. The form will also capture your GPS co-ordinates, which will give us more information about how likely it is that the plant is Japanese Knotweed.