Mining and smelting activity in Sudbury, Ontario, led to widespread pollution that acidified the landscape leaving ~65 km2 devoid of vegetation and an additional ~80 km2 semi-barren. Peatlands experienced a loss of characteristic species, such as Sphagnum mosses, following a pollution gradient decreasing outwards from the smelters. Pulverized calcium carbonate applied via aerial liming was used during upland forests reclamation to neutralize soil acidity and decrease metal bioavailability. While aerial liming is a well-established forest reclamation technique, the effects of liming on wetlands that were previously peatlands remain understudied, particularly the successional trajectory of wetlands limed during reforestation efforts. We follow up on a paired experimental wetland liming operation where, in 1994, a catchment’s wetlands were limed and the adjacent catchments’ wetlands were not limed. Specifically, we assessed limed and unlimed wetlands after ~30 years, comparing their hydrochemistry, soil chemistry, and vegetation community structure. After 30 years, pH, CaCO3 alkalinity, and dissolved copper were significantly (p<0.05) higher in the limed wetlands, but no differences existed in dissolved nickel. Limed wetlands had significantly higher vascular and non-vascular species diversity than unlimed wetlands, including greater Sphagnum cover (p<0.05) with a greater number of Sphagnum species present (p<0.05). Despite clear differences in vascular and non-vascular vegetation, there was no difference in water table dynamics between limed and unlimed wetlands, suggesting key wetland processes had still not returned. Nonetheless, the differences in vegetation diversity indicate that liming may be a valuable tool for enhancing natural vegetation succession in smelter degraded wetlands.