Step 2. Stare at this picture for a moment, to confirm your sloe identification skills. Sloes are the berries of the blackthorn bush, which is a common bush which grow in hedgerows in England. (Hedgerows are sort of like wild hedges that grow on country paths in England; they're not exactly wild cause someone planted them but some of them are over 700 years old. So they seem sort of wild, or at least really old.) Sloes are blue and round, and larger than blueberries. They taste fairly nasty on their own.