Japanese Knotweed Identification
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Flowers
Small, white, delicate blooms on 10cm spikes in late summer, attracting bees.
Leaves
Shovel-shaped, up to 15cm, reddish in spring, green in summer, arranged alternately.
Stems
Hollow, bamboo-like, reddish-purple in spring, green with red flecks in summer, brittle and brown in winter.
Shoots
Winter Appearance
Reddish-brown, emerging in early spring, often through cracks in pavement or walls.
Rhizomes
Winter Appearance
Winter Appearance
Thick, invasive roots, typically 1m deep but can extend to 3m.
Winter Appearance
Winter Appearance
Winter Appearance
Dormant, brown canes that appear dead but can regrow.
Spring
Reddish-purple shoots emerge, turning into green leaves by late spring.
Summer
Grows 2-3m tall with spade-shaped leaves and white flowers by August.
Autumn
Leaves yellow, stems turn brown, flowers persist until October.
Winter
Dormant canes, but rhizomes remain active underground.
