- I haven't been looking for eight hours every day, but I've had a bit of time since the project started in 2020, she says and laughs a little.

How is the age of a tree determined?

She has searched, not with light and lantern, but well with drill and determination. And counted annual rings.

About 50 trees in the nature reserve at Norra Berget in Sundsvall have been age determined in the search for the "right" tree.

- In October there was a jackpot, she says.

Can get a supporting role in the celebration of Sundsvall

On weekdays, Jennie works at Mittuniversitetet where, among other things, she teaches practical nature conservation and biodiversity and researches in dendrochronology, the study of annual rings.

The task of finding a commemorative stable is a collaboration between the university and the municipality of Sundsvall.

- I think this tree will play a small role in the celebration of Sundsvall, says Jennie.

In the video, you get to go out into the forest and see where the pine tree grows and what characterizes it. And how do you go about determining the age of a pine tree?