A grassy flavor in beer is often associated with which issue?

A grassy flavor in beer typically originates from issues related to poor storage, specifically exposure to light or improper temperature control. When beer is not stored correctly, particularly in clear or green bottles which allow more light penetration, it can result in the degradation of hop compounds and other flavor active substances. This degradation leads to the formation of certain off-flavors, including a grassy or "green" note, often due to oxidation or reaction with light.

While other factors like poor fermentation or excessive carbonation can affect the overall quality of beer, they do not specifically correlate with the grassy flavor profile as directly as storage conditions do. High hop usage can lead to distinct hop flavors and aromas, which are typically pleasant and not characterized by grassiness. Hence, understanding the importance of proper storage is crucial for maintaining the quality and flavor integrity of beer.