They have the lowest level of vitamin C of all the wild berries, however. Lingonberries contain a significant amount of vitamin E. The best time to pick lingonberries is from late August to early October. The best berry-picking spots yield 100–500 kg per hectare. The most prolific lingonberry plants will often grow in the clearing that remains after final felling or under seed trees. The lingonberry is most productive in areas where the tree canopy does not block sunlight from reaching lower levels of growth. The weather is more stable at this time and there is a greater abundance of pollinating insects. The harvest is more reliable than that of bilberries, as the lingonberry flowers a few weeks later. The lingonberry yields the largest crop of all the wild berries. It can also be found in pine or spruce bogs, in herb-rich forests, on rocky outcrops, on tundra heaths and at the edges of fields. Typical habitats include xeric, sub-xeric and mesic boreal forests. It is the most common shrub among the types of forest undergrowth found in Finland. The lingonberry grows throughout Finland. The bitter-tasting lingonberry is globose, red and juicy. The inflorescence is a dense terminal raceme. Its urceolate or pitcher-shaped corolla is 5–8 mm in length and either white or reddish. Its leaves are overwintering, tapering, have a waxy surface and are green on top and light green underneath. The stems of the plant are woody and hairy. The lingonberry is an erect or ascending shrub growing to a height of 5–30 cm.
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