WHAT THE EVIDENCE SAYS
The study mapped invasive alien plants across 18 cities and counties and tested alternative planting at two field sites. Giant ragweed, bur cucumber and common ragweed remained widespread despite long-running removal, while Forsythia koreana plots showed less herbaceous invasion than bare-ground and reed treatments during the pilot season.
WHY IT MATTERS / OUR READ
Weed removal can create an ecological vacancy. Restoring a competitive resident plant community may be part of control rather than a separate beautification step, but the species and strategy need site-specific testing.
CAVEATS / UNCERTAINTY
The experimental evidence comes from only two test beds and a single growing season. The result is preliminary, does not establish long-term suppression, and should not be generalized as a universal recommendation to plant Forsythia after invasive removal.
SOURCE
Frontiers in Ecology and Evolution
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