It’s probably better to have all the inputs in the same blueprint, like the PlayerController class, instead of having the input events directly on the bush. From there, you either grab a reference for the bush with GetAllActorsOfClass or GetAllActorsWithTag to set a bool variable in the bush.
On the bush itself, it’s just a question of setting the bools and proceed to the health decreasing code. As an alternative, you can also use a looping timer for the decreasing health