There is a long post about how to scarify seeds but here is a way that wasn't mentioned. I used Elmers school glue to completely cover about 25 red bud seeds on a piece of thin stiff cardboard(not corrugated). When the glue was dry after several hours I used sandpaper to sand off the tops of all the seeds at once. Then I bent the flexible glue and the seeds popped right out ready to soak. If the seeds had stuck I believe the water soluble school glue would have come off in the soaking. I will post about the success or failure of the seed after exposure to glue but the glue is non-toxic so I think I am OK. Ric