Responses to treatments and the control throughout the study for non-native plant densities, including annual grasses and all non-native plants by harmfulness rating from the California Integrated Pest Management (Bell et al. 2015). Estimates and standard error are based on the square root of the plant count per five meters squared. Solid lines represent the regression coefficients, shaded areas are the 95 % confidence intervals, dotted lines are the boundaries of the 95 % confidence interval, and points are the square root of the density within 5 m2 for each survey year. The untreated controls were modeled as if they had been treated one year after their initial sampling period, and pretreatment measurements were modeled as controls.