Blackthorn berries (also known as sloes) are edible, but they are very tart, astringent, and bitter when eaten raw. The seeds inside the berries are inedible and poisonous, so only the flesh should be consumed. These berries are often used cooked or processed, such as in jams, jellies, baked goods, sauces, or fermented into alcoholic drinks like sloe gin. The flavor improves if the berries are harvested after the first frost, which lessens their astringency. Blackthorn berries contain beneficial nutrients but are typically not eaten fresh due to their strong tartness. They should be used with caution, avoiding seeds, and can be enjoyed in various culinary preparations.
Additionally, the flowers and leaves of blackthorn should be used carefully as they contain compounds that can produce cyanide in large amounts. Pregnant women should avoid consuming these parts.
