Hello! I planted this Acer Japonicum Yama Kage around a month ago. Before I planted it the trunk was a green color (pictured on the left next to a Twomblys Red Sentinel), now it’s red (which I am sure is fine), but it has developed a dark coloration where the branching starts(shown in second photo). Is this normal? I don’t think I’ve seen any of my other maples do this, but I’ve never had a Japonicum.