Lookalike guide
Japanese knotweed vs Broad-leaved dock
Red-tinged spring knotweed shoots can look like dock, especially on waste ground where both grow.
Broad-leaved dock (Rumex obtusifolius): Native weed — common and harmless.
| Feature | Japanese knotweed | Broad-leaved dock |
|---|---|---|
| Growth | Shoots rise into canes up to 3 m tall | Leaves mostly in a low rosette from the ground |
| Leaves | Shield-shaped, about as wide as long | Long oval leaves, much longer than wide |
| Seed | Cream flower sprays | Rusty-brown seed spikes |
Quick test
Dock never forms hollow bamboo-like canes.