Japanese knotweed found near Katowice and Tarnowskie Góry
was recorded on 2026-09-15 near Katowice and on 2026-09-12 in multiple sites including Tarnowskie Góry and Katowice.1 The plant produces white flowers in late summer and early autumn, the phenological window during which fragmenting rhizomes present peak dispersal risk, particularly along riverbanks where human activity may carry root segments downstream.1
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