Sloe (Prunus spinosa) or Blackthorn is a deciduous, much branched and very spiny shrub of the family Rosaceae with spinose branches and hard tough wood. The leaves are small, alternate, oval, stalked, finely serrate, dull above and hairy below. The fruit are black-coloured or deep- purple in colour berries about the size of a small damson, and are used for preserves, sloe gin and a fictious port wine. Research Sloe