Wild berries require varying conditions as their habitats between species but in general they grow in different types of forests; some species also or mainly on mires. Weather, light and nutrient conditions along with successful pollination regulate the size and quality of harvests. The ideal habitat structures vary throughout Finland
Cowberry (Vaccinium vitis-idaea) and bilberry (Vaccinium myrtillus) produce largest harvests of wild berries. Cowberries grow abundantly in sparse pine-dominated heath-forests but grow also in forested mires. Areas where light accesses the ground are suitable habitats for cowberry. Typically mature and seedling stands with poor soil fertility produce abundant harvests of cowberries. The largest harvests grow in Lapland, Kainuu and Nothrern Ostrobothnia.
Bilberry prefers sparse and mature spruce-dominated forest stands. Good yields are also harvested from pine-dominated forests. Only a small share of the harvests are picked from mires. The largest bilberry yields as well grow in Lapland, Kainuu and Northern Ostrobothia.