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Nantyglo (Nant-y-glo, "coal stream") is a former ironworks village on the upper shoulder of the Ebbw Fach valley, sitting between Blaina below and Brynmawr above on the valley rim. The Round Towers — two fortified refuges built by iron-master Crawshay Bailey in the 1820s to protect against feared workers' uprisings — survive on the hillside as an unusual local landmark. The moorland above Nantyglo on Mynydd Coedy-y-Bere carries heather and gorse; bramble is dense on the reclaimed tip and forest-edge margins above and below the village; sycamore dominates the streamsides and enclosed cottage gardens of the settlement itself. The Gwent Beekeepers' Association provides swarm-collection cover for the village.

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.