Sanguisorba 'Blackthorn' is a cultivar in the burnet genus Sanguisorba, part of the rose family Rosaceae. It bears the genus's small, densely clustered flowers during June to August. Leaves are pinnate and arise from a central 

, while flowering stems extend above the foliage. Individual flowers are very small and occur in compact inflorescences.

Sanguisorba 'Blackthorn' sits within the burnet group of the Rosaceae and follows the general form of its genus: herbaceous or subshrub habit with a crown of pinnate leaves and erect flowering stems. The flowering season runs from June to August, when the plant produces tight clusters of small flowers; individual blooms are very small and grouped into compact inflorescences. Observe specimens of Sanguisorba to decide best placement: the genus typically sends up stems that rise above a basal rosette of pinnate leaves, so allow room for the flower spikes to show. Young leaves emerge from the crown and the flowering stems can reach well above the foliage, so give the crown clear soil and avoid burying it when planting. Cutting spent flower stems after seed set will keep the plant tidy through late season. Sanguisorba 'Blackthorn' suits mixed perennial borders and schemes where narrow, airy flower spikes are wanted from early to high summer. It pairs readily with grasses or broader-leaved perennials that provide a backdrop for the compact flower clusters, and positioning should consider how the flowering stems will sit relative to neighbouring plants to allow the small inflorescences to be visible during June to August.

Sanguisorba 'Blackthorn' is a cultivar in the burnet genus Sanguisorba, part of the rose family Rosaceae. It bears the genus's small, densely clustered flowers during June to August. Leaves are pinnate and arise from a central crown, while flowering stems extend above the foliage. Individual flowers are very small and occur in compact inflorescences.

Sanguisorba 'Blackthorn' is a burnet cultivar that flowers from June to August with compact clusters of very small blooms.

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