Thread:Paul.rea/@comment-62.150.56.183-20130905135816/@comment-4091815-20130905141958

The nemeton is charged up by sacrifice.

There was a residual charge left over months after Paige was killed there.

The sacrifices Scott, Allison and Stiles made to take the place of their parents supercharged the site meaning it is now more powerful than it's been in years.

Deaton told us that other supernaturals will sense this power and seek it out.

As for what Chris said - the act of cutting down the tree brought disasters to nearby towns. That happened presumably sometime in the distant past since the tree was just a stump when Paige died there.

There are more details at our Druid page.