In addition to forest-like bogs, there are also open bog types. No trees usually grow on these kinds of bogs.

Open bogs are low in nutrients. If any trees can be found, they are usually short pines. Different sedges grow on the ground, above dense mats of peat moss. Some pine swamp species can be found growing on dry tufts of land. Some open bogs are wet and sludgy, whereas others are more dry. 

Open bogs are low on nutrients.

Fens are treeless bogs that are rich in nutrients. They can be found only in places where lime can be found in the soil. Fens can accommodate some tree growth, but some are completely treeless. Fens accommodate a number of plant species that thrive only in their nutrient-rich soil type, such as various orchids, heather and wild angelica. 

Fens are a relatively rare bog type. They are almost completely nonexistent in Southern Finland, whereas only approximately 2 % percent of the bogs in Northern Finland are fens. This is because lime-rich soil is not usually found on top of the Finnish bedrock. In addition, some fens have been dried and converted into farmland.

Fens are open bogs that are high in nutrients.

The edges of many lakes and ponds have grown boggy. Such areas are called water meadows. Their vegetation is often a mixture of shoreland species and bog plants.

BOG TYPES

Type	Characteristics	Other
spruce bog	A forest-like bog type with pine as the most prominent species.	Small spruce bogs can be found growing near small brooks.
pine swamp	A forest-like bog type with spruce as the most prominent species.	Many pine swamps have been ditched and are used in forestry.
open bog	An open bog that is low in nutrients.	The centers of aapa fens and raised bogs are usually open bogs.
fen	An open bog that is low in nutrients.	A rare bog type found in Lapland
water meadow	A type of marshland located near the shores of lakes and ponds.	A lot of water and shore plants.