Blackthorn

Prunus spinosa

Native to Europe and through Western Asia, the fruit of this small, spiny tree is often used as the base for fruit drinks. Also known as Sloe, its small dark purple fruits, or drupes, are added to gin and sweetened to produce a flavored liqueur. Often used as a hedge, it can become quite invasive.
Habitat:
Deciduous small tree or shrub
Presence in US:
CT DC ID MA MD ME MI MO NH NJ NY OR PA TN WA
Presence in Canada:
BC ON