Whether it's acceptable to leave wicker outdoor furniture outside throughout the winter depends heavily on the material. For synthetic all-weather wicker, typically made from resin or vinyl, it is generally okay if properly protected. However, natural wicker, crafted from materials like rattan or bamboo, should never be left outdoors in cold, wet conditions.
All-weather wicker is designed to withstand the elements, but winter still poses threats. Moisture is the primary enemy; snow and rain can seep into the frames, causing rust or mildew. To protect it, thoroughly clean the furniture and apply a specialized, waterproof cover that is breathable to prevent moisture trapping. Elevating the furniture off the ground with feet or bricks is also crucial to prevent water damage and freezing to the surface.
Natural wicker furniture lacks the durability for winter exposure. The freezing and thawing cycle will cause it to become brittle and crack. Constant moisture leads to mold, mildew, and eventual structural rot. For natural wicker, indoor storage in a garage, shed, or basement is non-negotiable for its preservation.
In conclusion, while high-quality synthetic wicker can brave the winter with meticulous preparation, natural wicker cannot. For both types, proper cleaning, protective covers, and ideally, indoor storage, are the best practices to ensure your furniture looks beautiful for many seasons to come.