Outdoor artificial plants are the most difficult to maintain because they are exposed to moisture, wind, and sun. You can move your plants to a covered location during rain or during the summer months when the sun is at its brightest. Of course, this is inconvenient. Another option is to spray your plants with a UV protector like TriNova UV Protectant Spray. To do this, make sure your plant is clean and dry. Next, spray in a systematic way working around the entire plant. Make sure to coat at least every six months.