No wait and still not necessary to grow berries ot mushrooms or thistle.

Those resources all grow themselves and re-spawn.

Berry bushes are subject to physical destruction. A careful viking avoids combat and logging operations in the immediate vicinity of these resources. A careful viking might even leave a single bush in a cluster of berry bushes unpicked to provide a visual cue pending re-spawn.

A country boy can survive; a city boy needs mods.