Blackthorn flower

Pruni spinosae flos, blackthorn flower.  

Blackthorn flower consists of the dried flowers of Prunus spinosa L.  [Fam.  Rosaceae], as well as preparations thereof.  

Preparations of blackthorn flower are used for common colds, diseases and ailments of the respiratory tract, as a laxative, for diarrhea, for prophylaxis and therapy of gastric spasms, bloating, intestinal diseases and dyspepsia, also for dropsy, ailments of the kidneys and bladder, bladder spasms, as a diuretic, diaphoretic, and for general exhaustion, convalescence, and, externally, for rashes, skin impurities and for "blood purification."

None known.  

Since the effectiveness is not sufficiently documented, a therapeutic application cannot be recommended.  

There is no concern for the use of the herb as a coloring agent for tea mixtures.