Bernard Castelein / Cotton Grass (Eriophorum vaginatum) growing in water. Goldenstater Moor, Niedersachsen, Germany.

Bernard Castelein / Cotton Grass (Eriophorum vaginatum) growing in wetlands. Venner Moor, Niedersachsen, Germany, May.

Heike Odermatt / Moor Grass (Molinia caerulea) covered with frost, Valkenswaard, Netherlands

Heike Odermatt / Moor Grass (Molinia caerulea) covered with hoarfrost, Valkenswaard, Netherlands

Duncan Mcewan / Purple moor grass {Molinia caerulea} close up of flowers, Scotland, UK

Geoff Simpson / Deer grass {Trichophorum cespitosum} in autumn, Alsop Moor, Derbyshire, UK

Chris O'Reilly / Purple moor grass {Molinia caerulea} growing beside a stream in summer, sequence 1/2, Elan valley, Wales

Chris O'Reilly / Purple moor grass {Molinia caerulea} growing beside a stream in winter, sequence 2/2, Elan valley, Wales

Bernard Castelein / Purple moor grass {Molinia caerulea} and Cross leaved heath {Erica tetralix} Kalmthoutse Heide, Belgium