Drumcrow is an important site because of its diverse fen flora. Fens are wetlands that are rapidly disappearing from our countryside due to drainage, infilling and nutrient enrichment.

Drumcrow contains a number of wetland habitats including fen, fen meadow, wet grassland and open water. The fen is dominated by sedges and rushes along with flowering plants such as Meadowsweet , Lesser Spearwort, and Cuckoo Flower. The fen Meadow contains Sedges and grasses along with attractive flowering plants such as Devil's-bit Scabious, Marsh Violet, and Meadow Thistle.

Drains running through the site contain wetland plants such as Water-plantain, Creeping Yellow-cress, and Fine-leaved Water-dropwort.

Drumcrow also contains a number of rare plants such as Royal Fern and Common Meadow-rue.