This study investigated the temporal dynamics of biomass accumulation and metal uptake patterns in Sedum plumbizincicola grown under short-term (30-day) and long-term (90-day) Free-Air CO₂Enrichment (FACE) conditions (+200 ppm above ambient) across three distinct soil types: Perudic Luvisols (pH 5.5), Hydragric Anthrosols (pH 6.5), and Udic Cambisols (pH 7.5). The results revealed that short-term elevated CO₂ exposure significantly enhanced various biomass parameters including leaf fresh weight, stem fresh weight, and plant height, with the most substantial promotion observed in Perudic Luvisols soil where leaf fresh weight increased by 2.51-fold, compared to more modest improvements in Hydragric Anthrosols soil. However, these growth stimulation diminished under prolonged CO₂exposure, with only Udic Cambisols soil maintaining statistically significant differences in biomass accumulation. Regarding metal absorption dynamics, short-term CO₂enrichment markedly improved the uptake of essential elements such as K, Ca, and Mg, particularly in Perudic Luvisols soil where K and Ca accumulation was most pronounced. However, the advantage of metal absorption was weakened after long-term high CO₂ treatment. This study preliminarily investigated the soil-dependent variations and spatiotemporal dynamics of Sedum plumbizincicola growth and metal element uptake under elevated CO₂ conditions, providing a theoretical basis for optimizing phytoremediation techniques in heavy metal-contaminated soils.