Poterium is a genus of flowering plants placed in the family Rosaceae. Members of this genus produce flowers in the UK summer, with blooms occurring from June to August. Species differ in form and cultivation needs, so check the plant name and supplier notes before buying. Select specimens with healthy crowns and clear labelling of the species for best results.

Poterium is a genus in the Rosaceae that flowers from June to August; check species-specific growing notes before planting.

https://en.wikipedia.org/wiki/Sanguisorba

Sanguisorba is a genus of flowering plants in the family Rosaceae native to the temperate regions of the Northern Hemisphere. The common name is burnet.

Poterium

Sanguisorba tenuifolia 'alba' is a member of the Rosaceae, placed under the genus Poterium and commonly called Burnet. It produces white flower heads that appear in summer, providing a clear June to August display. Gardeners choose it for summer structure and cut-flowers rather than for foliage effect. Check supplier details for siting and soil recommendations before planting.

Burnet Sanguisorba tenuifolia 'alba' flowers from June to August and provides white summer blooms for borders and cutting.