Nature in Finland sleeps and gathers
strength throughout the winter season.
Perennial plants, e.g. trees, start storing
up nutrients in their roots, stems, buds
and other overwintering parts already in
the summer. The plants adjust to colder
and colder weather over the autumn.
Bilberry plants, for instance, hold out in -
30°C in January but only -15°C in
October. Most of the water in the cells
leak out between the cells in the autumn.
The remaining cell liquid contains more
sugar, it gets concentrated and
withstands lower temperatures.
This is one way of plants dropping their
freezing point inside the cells.
Nature starts waking up in the spring.
Spring frost is the worst threat to a good
crop of wild berries if the plants have
already burst out in bud and bloom.
Frostbites may reduce the crops and,
in some cases, the entire crop may be
lost. The berry plants which grow on flat
country will get more easily frostbitten
than those which grown by waterways and on slopes. 2008, for instance, was a
very bad year for bilberries as their
blooms got frostbitten nearly all over
Finland, due to cold spring weather.