Prunus spinosa of the fruit caused by the fungus "Taphrina pruni" produces an elongated and flattened gall, devoid of a stone. The shrub, with its savage thorns, is traditionally used in Britain and other parts of northern Europe to make a "cattle-proof" hedge. The fruit is similar to a small damson or plum, suitable for preserves, but rather and for eating, unless it is picked after the first few days of autumn frost. This effect can be reproduced by freezing harvested sloes. The juice is used in the manufacture of fake port wine, and used as an to impart roughness to genuine
Prunus ursina It is usually present in too small a quantity to do any harm but any very bitter seed or fruit should not be eaten. Consumption of small quantities of hydrogen cyanide stimulates respiration and improves digestion. Excessive consumption of the toxin can cause respiratory failure and death. "Prunus ursina" fuits better in full sun but is still successful in partial shade. The tree will form suckers if its shallow roots are damaged. Among the pests that affect the "prunus" genus is honey fungus. the seed requires 2–3 months cold stratification in order to germinate. Prunus ursina Prunus ursina (bear's plum,