Yes, you can put plastic trays in recycling, but it largely depends on your local recycling guidelines as not all types of plastic are recyclable. Generally, plastic trays that are made of PET (Polyethylene Terephthalate) or HDPE (High-Density Polyethylene) are accepted in most recycling programs. These types of plastics are often used in food packaging, such as fruit or vegetable trays and they are usually marked with recycling symbols 1 and 2 respectively. However, it's crucial to clean these trays thoroughly before placing them in the recycling bin to avoid contamination. Always check with your local recycling center or municipal waste service to ensure you're following the correct procedures.