Tall-herb and fern vegetation of the nemoral and boreal zones, including stands of tall herbs on hills and mountains below the montane level. Tall herbs are often dominant along watercourses, in wet meadows and in shade at the edge of woodlands.
Tall herbs fringe communities on banks of runnning waters on gleyic soils with humus horizon. Characteristic species are Petasites spp., Filipendula ulmaria, Aegopodium podagraria, Chaerophyllum hirsutum, Urtica dioica, Mentha longifolia, Angelica sylvestris, Caltha palustris, Crepis paludosa, Epilobium hirsutum and Geranium palustre. Vegetation of Calthion, Senecionion fluviatilis, and Petasition officinalis is found in this unit. Often replaced by neophytes or ruderal plants.