Since fallout 3 take place in 2277 and fallout 4 take place in 2286
I wonder what happened to Harold in fallout 4, when considering that he doesn't appeared in that games, neither new Vegas at all
I would think he might've being killed or died peacefully (depending on choices if you choose to killed him or not), cus killing him couldn't be canon at all, because fallout 4 didn't mentioned anything about him being dead, which could means that he is still alive around, just that he probably becomes a normal tree when 9 years passed by during the fallout timeline