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This study  examined the influence of sediment grain size and soil amendments on plant  growth, soil and porewater characteristics, and greenhouse gas exchange  for three key US salt marsh plants: Spartina alterniflora, Spartina  patens, and Salicornia pacifica. We found that bioavailable nitrogen  concentrations (measured as extractable NH4+-N) and porewater pH and  salinity were found to have an inverse relationship with grain size, while  soil redox was more reducing in finer sediments. This suggests that  utilizing finer sediments in TLP projects will result in a more reduced  environment with higher nutrient availability, while larger grain-sized  sediments will be better flushed and oxidized. We further found that grain  size had a significant effect on vegetation biomass allocation and rates  of gas exchange, although these effects were species-specific. We found  that soil amendments (biochar and compost) did not subsidize plant growth  but were associated with increases in soil respiration and methane  emissions. Biochar amendments were additionally ineffective in  ameliorating acid sulfate conditions. This study uncovers complex  interactions between sediment type and vegetation, emphasizing limitations  of soil amendments. 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