Autumnal

A cold night and a brisk wind in the early morning persuade some of the least robust to give up the ghost.
Bracken is a softy in this respect. It may bully its way acros the ground at amazing speed changing the appearance in a week or two. But there's no stickability about it.

The first cold night and it's suffering; the tender new fronds turn brown and look very sickly. Certain parts of Blacka are more prone to this bracken scorching than others, mostly in the more sheltered spots.