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St Asaph (Llanelwy) is the smallest city in Britain by population, centred on its medieval cathedral at the confluence of the Rivers Clwyd and Elwy in the northern Vale of Clwyd. The cathedral close holds mature lime, horse chestnut and a mixed shrubbery providing early forage; the riverside meadows along the Elwy carry meadowsweet, willowherb and white clover in summer. The fertile Vale of Clwyd farmland surrounding the city produces a reliable June and July flow from white clover and field beans. Hawthorn hedgerows are dense in the peri-urban fringe; sycamore dominates the road margins and the grounds of the former North Wales Hospital. Elder scrub and marsh thistle line the damp hollows along the Elwy.

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.