Mixed hardwood logs species, such as alder, black alder, maple, elm, and black cherry, can often be bought from multiple suppliers. These logs are understandably very popular as they have many advantages. Their availability is good and firewood processors are able to offer better deals for mixed species logs compared to the other species. Mixed hardwood logs normally burn out slightly faster and generate slightly less heat output than the denser woods. Mixed hardwood logs are available for sale in crates or nets.