Pot-culture experiments were conducted to investigate the single effect of benzo[a]pyrene (B[a]P) and the
joint effect of metal–B[a]P on the growth of Tagetes patula and its uptake, accumulation and dissipation of
heavy metals and B[a]P. Results showed that the low concentration of B[a]P (≤10mgkg−1) could facilitate
plant growth and resulted in an increase in biomass at the rate of 10.0–49.7% relative to the control.