Board Thread:Spoilers!/@comment-6175354-20131105202753/@comment-23906605-20131203135644

Well, Mary Margaret has been back to the EF in season 2 and her hair did not grow back. It does make sense that the long hair might be the result of this new curse, though.

Which is a bit weird to me, because if I were to cast a curse, making people's hair short or long would definitely not be in my list of priorities.