User blog comment:Berserkchart486/Warring States Fanon Canon/@comment-3444730-20141225024757/@comment-25152698-20141226203503

A new husk is being made from centuries of bloodshed. For however long the actual tree may have taken to form, it's definitely logical to say a period of 300 years could atleast have resulted in something along the lines of a husk.

So that being said and all, the tailed beasts merging together would also tremendously increase the rate at which the tree would have normally required to grow, so yeah, that's how a new one came to be.