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Thornbury is a historic market town on the Severn Vale between the Forest of Dean and Bristol, its late-medieval castle, St Mary the Virgin Church and a fine high street of Georgian and Victorian buildings giving it a distinct character. Hawthorn and elder are dense on the Severn Vale farmland hedgerows around Thornbury toward Oldbury-on-Severn and Olveston; oilseed rape on the flat river-plain fields is a defining April flow; and the churchyard limes and the ornamental trees of the Castle grounds carry the June town-centre bloom.

Oilseed rape on the Severn Vale farmland between Thornbury, Oldbury-on-Severn and the M5 corridor gives a strong April to May flow; the flat fields around Olveston and Aust carry it particularly heavily. Hawthorn and blackthorn are dense on the Cotswold edge hedgerows above Wickwar, Rangeworthy and Iron Acton, and the Frome valley farmland east of Yate carries a reliable hawthorn flow in late April. Lime trees line the older streets of Kingswood, Staple Hill and Mangotsfield and carry a June town-centre flow. The Filton Airfield and BAE Systems perimeter scrub carries extensive bramble and rosebay willowherb, and the Frampton Cotterell and Coalpit Heath old colliery reclamation ground is dense with bramble through July and August. Sycamore is abundant along field margins and roadside hedgerows throughout the Cotswold edge; white clover on the improved grasslands of the Severn Vale closes the main flow from June to August. Ivy on the Cotswold limestone walls and the older suburban garden walls closes the year in October.