Plot level plant data and ancillary parameters in Louisiana Universities Marine Consortium (LUMCON) area salt marshes from January 2016 to December 2018

Live and dead above-ground biomass, stem density, median stem height, and litter biomass, as well as below-ground biomass of Spartina alterniflora, were determined from 1-3 plots at three Louisiana salt marshes in 2016-2018. The sites were sampled monthly. Additional ancillary data on soil and water parameters such as soil and water temperature, redox potential, pH, organic matter content, dissolved concentrations of nitrate &nitrite, phosphate, and ammonium are included when available.