Hi! I am really new to gardening so I have lots of questions about how to approach this winter. I only have a small garden, some pots and two small raised beds. I wanted to ensure my soil can improve during the winter, as I don’t have anything I want to plant at the moment. Today I shredded all my own dead plants into the raised beds and buried it under, with coffee grounds and egg shells. I’m not sure if covering this with tarp is a good idea? I’m also not sure what else I can do to help my soil, as there doesn’t seem to be any worms or other insects digging around. The lowest temperature it’ll get in the garden is around -5. Is there any advice on what I can do to improve my soil and garden for next spring? Thank you!!