The Blackthorn or Sloe blossom is well in flower now. Posted on April 25, 2012September 6, 2022 by qwertyqweryt61 The Blackthorn or Sloe blossom is well in flower now, in fact some of it is beginning to drop. Unless we have some late frosts, it should be a bumper crop of sloes this year. Blackthorn or sloe blossom Blackthorn or sloe blossom closeup