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I've just tried the first bottle from a batch of APA I brewed and it has a very distinct (and unpleasant) earthy / peaty flavour. Reminiscent of healthy soil. The beer also finishes with a very sharp acidic bitterness (also unpleasant).

What could have caused this? Is it a process error somewhere? Infection / mishandling? Just a poor recipe?

Is it likely to disappear with age or should I flush the lot?


  • 3kg Light malt extract (syrup)
  • 0.5kg Dextrose

23L batch, 10L boil


  • 50g Willamette @ 30min
  • 50g Amarillo @ 20 min
  • 15g Amarillo @ 10 min

Hops left in the tub during primary (2 weeks) & cold crashed for a week. Racked into a bottling bucket to keep the crap out of the bottles.

Fermented with Nottingham yeast

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up vote 4 down vote accepted

I've often gotten that flavor from Willamette hops. That might not be your problem, but it's something to consider.

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After resting for another week, the earthy flavour has subdued a little (although still the strongest distinct flavour) and the acid taste has disappated completely. The Willamette now makes the most sense. I'll re-brew this again soon with a different bittering hop to test the difference. – Mark McDonald May 31 '11 at 12:42

Willamette hops are an earthy variety, IMO. It could also be something in your water. Extract has a certain mineral profile already based on where the extract was made. If your water at home has too much of one mineral that is already well represented it can give you some flavor issues. Rare but it does happen. Another water issue may be chlorine or chloramines in the water. All things to look into, but without tasting the beer myself its hard to pin point it.

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Earthy flavours can be caused by mold spores in the area you store your beer. They tend to occur in damp areas where the mold grow within the walls of the area and then passes a chemical through any porous surface into the beer (even some glass)

Next batch you make sanitise the equipment and then sanitise the walls, floors and stands etc where you will be storing and fermenting.

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