I have been doing quite a bit of tree trimming on the yard recently. I have found information on a little over half of the woods I have been trimming... Elm, I wouldn't use simply because of the amount of ash generated... PITA. I haven't seen any info on Mountain Ash, which isn't an ash tree at all. Any good?? I haven't been able to find a scrap of info on Caragana AKA Siberian Pea Tree. Does anyone know anything about that?? We have a few types of maples around, bu by the time I get around to cutting it, it's punky. Not good. I cut out a few big lilac trees. I hear it's good. Have some saved. I've been saving every scrap of Apple or Plumb and Cherry that I cut. Right down to the little twigs. We have a fruit bush here that I will be cutting in the fall to spring. It's called Saskatoon. Similar to blueberry. Is that any good to use?? I also have a huge supply of willow. Not sure of the variety. I have heard of a lot of people in the prairies using it.. Might have to give it a try.