A clear, practical guide to identifying Japanese Knotweed during winter — including dead canes, crowns, rhizomes and how the plant behaves below ground.
A complete 2026 guide to identifying Japanese Knotweed through the seasons, including stems, leaves, flowers, rhizomes and common lookalikes.
Japanese Knotweed looks very different in winter compared to the growing season. Although the plant appears dead above ground, it remains fully alive beneath the soil. Correct winter identification is essential for surveys, risk assessments and planning effective treatment.
Winter canes are dry, hollow and snap easily. They often remain upright until early spring and are one of the clearest winter indicators of Japanese Knotweed.
The crown is the woody base where new shoots emerge each spring. In winter it becomes more visible as surrounding vegetation dies back.
Bright orange rhizomes are often exposed in disturbed soil. These underground stems remain fully active throughout winter and are responsible for regrowth.
Winter is one of the best times to confirm Japanese Knotweed because surrounding vegetation has died back, making canes, crowns and rhizomes easier to spot.