Beetroot Everything you need to know The Farm Dream Photosynthesis & Oxygen Production (Daytime) Most trees and plants produce oxygen during the day through photosynthesis, which requires sunlight. They absorb carbon dioxide (CO) and release oxygen (O). What Happens at Night? William Morris Art Nouveau Jugendstil Floral Nature Plants" Poster by ArtHouseNiklas Redbubble Three Reasons Fungi Are Not Plants Are bedroom plants dangerous at night? It's true that plants release a small amount of CO at night, but it's nothing to worry about. Respiration happens all the time, even at