Holcus mollis is a rhizomatous perennial grass found in woods and hedgerows, growing to 50 centimetres (20 in) tall.

Rhizome growth occurs in the period May to November but is fastest from mid-June to mid-July.

The main distinguishing characteristics from H. lanatus are the presence of rhizomes, and the bearded nodes or 'hairy knees' on the culm.

[1] Holcus mollis is favoured by conditions in woodland clearings and at the early stages of coppicing.

The caterpillars of some Lepidoptera use it as a food plant, e.g. the Essex skipper (Thymelicus lineola).