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Rhyl is a seaside resort at the mouth of the River Clwyd on the north Wales coast, where the river broadens across a sandy estuary. The town grew rapidly in the Victorian and Edwardian eras as a railway destination, and its terrace streets and boarding houses extend back from the promenade. The dune system west of the town carries sea buckthorn and marram grass, with dune slacks holding bramble and willowherb; sea buckthorn is a significant late-summer pollen source. The agricultural hinterland south of the urban fringe is intensively farmed Vale of Clwyd, providing white clover and, in April and May, oil-seed rape and borage. Sycamore lines the roadsides and cemetery grounds; elder follows the River Clwyd corridor through the 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.