Green Mulberry.
                             is what the Koreans use . Split it from a 6-9-10 inch log 18 inches long 1 1/2 inches wide boil wood for an hour. 
                              #2.  after soaking wood in water" without mosquitos " for 1-2 weeks cover with cloth not necessary mainly to 
                              protect your wifes microwave. Heat for 30 seconds at a time wood will heat up quickly . "Be Careful " use hand protection.
                         
                                          It is a learning process, I quickly found out you will need a bending Jig . Watch the Korean bow making videos
                              and you should be able to see how it s done. Amazing how easy they make it look. 
                                           Good Luck. If you have not learned already.
                                                                                                     J.B.