Biodegradable mulch films may start to break down within a year, while non-biodegradable ones typically last around 1-2 years before requiring replacement. To maximize the use of mulch film, it is recommended to obtain a UV-stabilized polyethylene film that is at least 1-1.5 mils thick. Proper installation and careful gardening practices will also significantly extend its usable lifespan. Replace the standard black mulch film every 1-2 seasons or more frequently if it becomes torn or degraded by sunlight. Remove and replace any mulch film that is no longer intact.