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Mostyn is a small Dee-side port village at the northern tip of Flintshire, where the estuary widens into the outer tidal reaches and the limestone plateau of Halkyn Mountain descends steeply to the coast. The Mostyn Docks serve offshore wind turbine assembly; behind the port the lanes run through hawthorn-and-limestone-grassland farmland rising towards Llanasa and Ffynnongroyw. Gorse on the upper plateau margins and bramble on the hedgerow banks and coastal scrub contribute a strong spring flow. The Flint and District BKA covers Mostyn.

Sycamore is the dominant flow tree throughout Flintshire, lining the lanes and valley sides from the Alyn valley near Mold to the wooded dingles of the Greenfield Valley. Hawthorn hedgerows are exceptionally strong on the Halkyn plateau and the Hawarden ridge, delivering a reliable May flow across the county. Lime trees in the older town centres and on the Mold and Caerwys market streets contribute a July supplement. White clover is widespread on the pastures and recreation grounds of the lower valleys and coastal plain. Bramble is abundant on the former industrial and railway land around Shotton, Buckley and the Greenfield Valley margins. Gorse on Halkyn Mountain provides a late-winter and spring pollen source. Alder and willow along the Dee foreshore and the Alyn riverbanks contribute early pollen for colonies emerging in spring.