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Castlebay is the main village on the island of Barra, the southernmost inhabited island in the Western Isles council area, a small harbour settlement overlooked by Kisimul Castle on its islet in the bay. Barra is smaller and more sheltered than the Uist islands, its southern end rising to the hill ground of Heaval above the village, and its western coast carrying machair grassland and sandy beaches. The island has a mild Atlantic climate tempered by the Gulf Stream; gorse flowers from early spring, and clover and thyme on the machair provide the main summer flow. Beekeeping on Barra is small-scale but the island's sheltered valleys and machair strips provide good forage through the summer months.

Machair — the distinctive shell-sand grassland of the Atlantic coast — is the most celebrated forage environment of the Western Isles, supporting wild thyme, clover, bird's-foot trefoil, ragged robin and corn marigold in summer on North and South Uist and western Benbecula. White clover and red clover on improved croft grassland provide the main June-to-August flow across all the islands. Heather on the Lewis and Harris moorland — one of the largest continuous heather blankets in Britain — is the defining late-season flow, running from late July through September; bell heather predominates on the drier ground. Sycamore in the Lews Castle grounds and town parks around Stornoway provides a productive May flow in the only sizeable urban forage zone. Gorse is abundant on the roadsides and rough ground of Lewis and Harris from March into June. Bramble flowers on disturbed ground and roadsides throughout the islands from July into September. Ivy on older stone buildings and walls closes the season in October for colonies in more sheltered positions.