The effects of winter minimum temperature, soil moisture, and soil nitrogen concentration on seed germination in March 2009 and dormancy in May 2009. Blue circles depict I. glandulifera (G), yellow I. noli-tangere (N) and those in black I. parviflora (P). Lines in the same colours show a significant relationship fitted with generalised linear mixed effect models, shading indicates 95% confidence intervals (yellow in I. noli-tangere and blue in I. glandulifera). Models for each species are based on 8 replicates (i.e. 2 sites at each of the 4 localities). The mean of three replicates per locality and site were used for seed germination and dormancy.