title_body: How can I learn to recognize the flavor and aroma of different varieties of hops?
upvoted_answer: This is a great question, I'm still learning but here's what I've tried:
  
  Single hop beers.
  
  I'm in the UK but here's what I've managed to get in the past
  
  
  Mikkeller single hop series 
  IPA is dead by BrewDog
  Arbor often do single hop beers
  
  
  Your mileage may vary but if you keep your eye out, hopefully you'll find a local brewer doing this kind of thing.
  
  I've also had a couple of single yeast flights which were very enlightening.
  
  Tastings
  
  A couple of hops really stick in my mind because of when I had them. I remember going to a tasting of a local's brewers Galaxy IPA and he'd filled the shop with glasses of Galaxy hops and it smelled incredable.
  
  Another time was tasting a Sorachi Ace beer by Wiper and True. It was horrific, but hearing the descriptions my fellow drinkers came up with and having the brewer explaining the history of the hop really anchored it to me. It meant when I had Little Things that Kill by weird beard, I could pick it out straight away.
  
  Geography
  
  The other thing that I enjoy is learning where and when and why a hop has come about. European hops are so different from American which are different again from British. Not to mention New Zealand hops which have their own aromas. Obviously it's not always consistant but being able to say what kind of region a hop tastes like is a good start!