Table 1.

Results of the lmer models for both Fallopia japonica and Urtica dioica performance parameters across the growing season of 2021. Chi-squared and corresponding p-values for all analyzed parameters are given. Treatment represents the effect of the copper treatment; time represents the effect of the time over the season when the parameter was recorded; and treatment * time represents the interaction between both parameters. Significant values below the level of 0.05 are printed in bold.

	Treatment		Time		Treatment * Time
	Chi2	p	Chi2	p	Chi2	p
Fallopia japonica
Plant height	77.37	<0.001	209.69	<0.001	3.89	0.273
Leaf number	48.82	<0.001	286.16	<0.001	21.35	<0.001
Chlorophyll content	40.49	<0.001	220.73	<0.001	8.65	0.034
Urtica dioica
Plant height	147.29	<0.001	383.30	<0.001	21.14	<0.001
Leaf number	35.88	<0.001	354.69	<0.001	30.85	<0.001
Chlorophyll content	14.73	0.002	232.31	<0.001	7.01	0.072