While polyethylene greenhouse covers sourced from a reputable supplier are built to last, at some point, you'll need to replace yours. Most greenhouse covers last somewhere between one and five years, but the life expectancy of yours will vary depending on the specific material, application, and climate.
No matter the level of UV resistance, the lifespan of your greenhouse cover is limited-and with time, the material will begin to wear and show obvious signs of deterioration, such as scratching, yellowing and, in some cases, cracking. While some defects are cosmetic or minor enough to be repaired, more severe damage to your greenhouse covering can affect light transmission, which can be detrimental to your plants. Using the same cover for longer than its intended lifespan could also contribute to damaging issues like mold, pest infestations, heat loss and more.