Abstract: Methods and apparatus for inhibiting growth of moss, fungus, algae, and other vegetation on roofs and other housing structures include a metallic strip mounted to the structure by non-intrusive mounting elements, as for example, adhesive, to avoid permanent damage to the structure to which the strip is mounted. The metallic strip, preferably formed from zinc or a zinc alloy, reacts with water, preferably rain water, to form a growth inhibiting solution which flows down the roof or other structure to which the strip is mounted. The strip defines a reservoir for increasing the contact time between water and the strip to increase the metallic content of the solution for more effectively inhibiting growth on the structure to which the strip is mounted.