"Critical Periods of Weed Growth between rows of Peppers" by Prof. Richard Ashly Plant Science, U.Conn Weeds up to 16 in away from the plant, for the first 14 weeks of growth can reduce yeilds up to 10% "Weed Control Stategies in Peppers on Plastic Mulch" by Rich Bonanno, Extension Weed Specialist. U.Mass Bottom line, Weeds left between the plant and the plastic can reduce production by 10% Peppers are the poorest plants for weed competition. Bottom Line: Back on your knees and pull those weeds. Byron