Mean above-ground weed biomass (g) (± SE) by treatment for the (A) Full sun environment, (B) tilled environment, and (C) shaded environment. Means with the same letter are not significantly different (P=0.05, n=3). CNH = control no herbicide, CWH = control with herbicide, LL =longleaf pine straw, SL = slash pine straw (n = 3). Biomass was cut and collected on 26-28 June, 8-12 July, and 14-17 August.