I am just curious as to the circumstances that may cause you to provide winter protection to any of your outdoor planted JM e.g. burlap windscreen for example? For example I planted a 4.5 foot Acer shirasawanum "Aureum" in October 2102 and at that time I put a wind screen around it for its first winter in the ground. It did just fine and so with one winter and one growing season in the ground, under its belt, I decided not to protect it similarly for this winter. I planted 3 other JM in 2013, generally early in the season and the only protection I have done at this point are plastic 8" trunk collars for any possible rabbit or rodent nibbling. What about you?