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Corwen is a small market town in the upper Dee valley at the foot of the Berwyn mountains, where the river runs broad and fast over gravel beds between steep wooded slopes. The town was an important droving and market centre for the Welsh uplands, and its older stone buildings cluster around a market square with the River Dee immediately below. The valley sides above Corwen carry dense sessile oak and ash woodland transitioning to bracken and heather moorland on the Berwyn plateau above 350 metres; the heather moor provides a July to September upland flow. Riverside alders and willows extend along both banks; bramble is prolific in the woodland edge and the old railway cutting north of town.

Sycamore provides the dominant May flow county-wide, heaviest along roadsides and in valley-side woodland. The Vale of Clwyd is prime agricultural land producing a strong white clover and field-bean flow through June and July; oil-seed rape on the river-plain fields gives an early April flow in good years. Hawthorn and blackthorn on the Clwydian Range provides the classic late-April blossom flow. The upland fringe above 300 metres carries heather and gorse on the Berwyn and Llantysilio mountains, giving apiaries at Corwen and Ruthin access to a July-to-September upland flow. Sea buckthorn on the Gronant and Foryd dunes provides pollen late into the season; ivy closes the calendar in October across the county.