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European mantis seen in Szczerbice
September 28, 2026
was observed on 2026-09-26 in Szczerbice. September marks the start of mating season when females feed heavily and lay their eggs before dying with the first hard frost, making this observation a sign of the species' reproductive window in the region.
Japanese knotweed found near Katowice and Tarnowskie Góry
September 28, 2026
was recorded on 2026-09-15 near Katowice and on 2026-09-12 in multiple sites including Tarnowskie Góry and Katowice. 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.
Giant goldenrod found in Piekary Śląskie
September 28, 2026
Giant goldenrod, a North American invasive species, was recorded on 2026-09-20 in Piekary Śląskie, south of Gliwice. Like also present in the region, it flowers in late summer and competes aggressively with native vegetation through both rhizomal spread and seed production.
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