In the Park, 1253 species of plants have been described. 70 of them have been listed by the Red List of Lithuania. The European – protected species grow here: Little grapefern (Botrychium simplex), Fen orchid (Liparis loeselii) and slender green feather moss (Hamatocaulis vernicosus). Some relicts of a glacial period have been found in the Park: Sawtooth sedge (Cladium mariscus), Tufted bulrush (Trichoporum caespitosum), Swamp sedge (Carex acutiformis), Perennial honesty (Lunaria rediviva), Lapland willow (Salix lapponum), Bird‘s eye primrose (Primula farinosa).
Biologists are amazed by numerous populations of Platanthera chlorantha, Pinguicula vulgaris, Dactylorhiza maculata, Dactylorhiza ochroleuca, Dactylorhiza longifolia, Liparis loeselii, Listera cordata. The only place of growing of Botrychium simplex was found here.