The world of plants in the National Park of Wielkopolska is extremely abundant. From the geo-botanical point of view the Park is located in the Wielkopolska-Kujawy region. It has been determined that the plant species naturally occurring here are: 1120 species of vascular plants, 148 species of moss, 150 species of lichen, 500 species
of algae, 800 species of fungi.

The main element of the Park's flora consists of Eurosiberian species, among others, the common pine (its share in the Park's forests is 70%), as well as many plants of the forest's ground cover, such as herb Paris, or May lily and Centraleuropean species, for example, the pedunculate oak, hornbeam, yellow foxglove and white cinquefoil.

From some northern plants, we could list the twinflower, a relict plant from the Ice Age. Because of the influence of a mild and humid climate of the Western Europe, species of a rather Atlantic character can be found among the plants of the National Park. Among others, common honeysuckle, pennywort and barren strawberry grow here.

A rare tree, sorbus terminalis, the so-called wild service tree, also belongs to plants
of a mild climate. Particular plant species are naturally grouped according to their environmental requirements.

The largest area of the Park is covered by forest complexes. Poor-quality podzol soil
is where the pine forests and mixed pine - oak forests are. Brown soil of higher quality is home to, among others, acid oak forests, and oak-hornbeam forests. Less dense oak forests grow in warmer places. The areas of humid and fat black-earth near lakes and streams are colonized by elm and ash, while marshlands are predominantly overgrown by European alder (alnus glutinosa) and brushes formed of silky asier and glossy buckthorn.

The plants in the lakes are equally fascinating. Almost all of the Park's lakes are of the eutrophic type, which means that they are extremely rich in mineral compounds.
In the lakes we can find various complexes of water and marsh plants. The plants growing farther away from the shore and fully immersed are the Eurasian water milfoil, hornwort, and various species of pondweeds. Closer to the shore we can find groups
of plants with their leaves on the water surface, such as, among others, the well-known complex of water lilies composed of the white and yellow water lilies. The lakes' shores are occupied by various reeds, composed of such species as: the common club-rush, narrow leaf cattail and broad-leaved cattail, sweet flag and common reed.

Completely different plants can be found in the only dystrophic (poor in minerals) lake within the Park - Lake Skrzynka. That is where peat moss grows, which encroaches with its thick layer onto the lake leading to its overgrowing. An already formed peat bog is home to round leaf sundew - a fascinating carnivorous plant.

The Park also boasts beautiful meadows. The most beautiful kind of them are the molinia meadows.