Germination and seedling frost tolerance differ between the native and invasive range in common ragweed.

The quadratic models explaining the relationship between temperature and cumulative germination were highly significant ( P < 0.001) and displayed very high R 2 -values (mean = 0.82 ± 0.08; ESM, Table A1) for each population.

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Seeds used in the germination experiment tended to be heavier in the invasive range compared to the native range, although the difference was not quite statistically significant (Table 2 ).

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