NVC community M20 (Eriophorum vaginatum raised and blanket mire) is one of the mire communities in the British National Vegetation Classification system.
Two constant species, Common Cottongrass (Eriophorum angustifolium) and Hare's-tail Cottongrass (Eriophorum vaginatum), are found in this community.
This community is found throughout northern England.
It is extensive in the southern Pennines, but more local elsewhere.
It is also found locally in eastern Scotland and south Wales.