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Llanhilleth is a former colliery village on the western bank of the Ebbw Fach, standing between Aberbeeg at the valley floor and the open moorland rising to Mynydd Manmoel above the housing. The village grew around Llanhilleth Colliery and retains its characteristic terraced rows stepping up the steep hillside, with the Ebbw Fach river corridor providing a natural forage strip of willowherb, meadowsweet and bramble through the valley bottom. Above the highest terrace rows the moorland edge carries gorse, bilberry and ling heather, giving colonies within the village direct access to an upland late-summer flow that is rare at this elevation. Sycamore lines every road margin and valley-side track; hawthorn is dense in the hedgerows between the settlement boundary and the moorland above.

Sycamore is the dominant May flow tree throughout the borough, flowering profusely on the valley sides from Blaina to Brynmawr. Hawthorn on the valley-rim hedgerows and blackthorn in the gorse-edge scrub supplements the April flow. Bramble is exceptionally dense on the extensive reclaimed colliery tip and forestry margins — a prolonged and reliable mid-summer crop — and rosebay willowherb adds colour and forage on every disturbed bank. White clover covers the playing fields and recreation grounds of the valley-floor settlements; the Clydach Gorge ash woods below Brynmawr add a limestone-flora element unusual in the valleys. Ling heather and bilberry on the plateau above 350 metres at Beaufort, Brynmawr and Tredegar give accessible late-summer heather forage rarely available this close to a valley settlement. A strong ivy flow on old stone terraces and chapel walls closes the year in October.