Plant pots that also serve as urinals installed in Amsterdam; pics surface  Amsterdam has installed special plant pots that double up as urinals across Red Light District and other hotspots of Leidseplein and Rembrandtplein. Called ' Green Pee ', the innovative urinals are aimed at discouraging tourists and locals from urinating on the street. The urine is regularly collected from planters for processing and phosphate harvesting in order to make fertilizer for plants.