What are the lifespan expectations for polyethylene versus polypropylene outdoor flower boxes in full sun?

When choosing outdoor flower boxes for full sun exposure, understanding the lifespan differences between polyethylene (PE) and polypropylene (PP) is crucial. Polyethylene flower boxes typically last 5-7 years in direct sunlight, as they are more susceptible to UV degradation despite being lightweight and flexible. Polypropylene flower boxes, on the other hand, often endure 8-10 years in similar conditions due to their superior UV resistance and higher melting point. Both materials will eventually become brittle and fade, but PP generally maintains structural integrity longer. For maximum longevity in full sun, look for UV-stabilized versions of either material, and consider darker colors which better resist fading. Regular cleaning and seasonal storage can extend the life of both types of plastic flower boxes.