My green tea tastes bitter

In short

Almost always water that is too hot, and almost never the tea’s fault. Work through the causes in order — the first one accounts for most cases.

Likely causes, in order

Most likely first. Answer the question under each one before moving on — several of these look alike in the cup and are told apart only by what was done to the leaf.

1. 1. Water too hot

   Temperature

   Check: Did you pour water straight from a boiling kettle, or from a kettle without a temperature setting?

   Fix: Let boiled water stand for three to five minutes before pouring, or add a splash of cold water. Most green teas want 70-80 °C; shaded Japanese greens want considerably less. This single change fixes the majority of bitter green tea.

2. 2. Steeped too long

   Over-extraction

   Check: Was the leaf in the water for more than about two minutes?

   Fix: Shorten the steep and taste as you go. Bitterness builds faster than sweetness, so a shorter steep loses less than you would expect.

3. 3. Leaf left sitting in the pot

   Over-extraction

   Check: Did you leave the leaf in the pot and pour a second cup later?

   Fix: Separate the leaf from the water when the steep is done — strain it out, lift the basket, or pour the pot off completely. A pot left standing is still brewing.

4. 4. Too much leaf for the volume

   Leaf quantity

   Check: Did you use noticeably more than a teaspoon of leaf per mug?

   Fix: Reduce the leaf. Note that teaspoons are a poor measure for tea — leaf density varies enormously between a fluffy white tea and a tightly rolled oolong — so weigh it if you can.

5. 5. Drying sensation rather than bitterness — this is astringency, not the same problem

   Leaf quality

   Check: Is the unpleasantness a taste on the tongue, or a rough, drying feeling across the whole mouth?

   Fix: If it is drying rather than bitter, you are dealing with astringency: polyphenols binding to proteins in saliva. Lowering temperature helps, but so does gentler handling — avoid stirring or agitating the leaf, and consider that broken or dusty leaf grades extract far more astringency than whole leaf.

6. 6. Very hard water

   Water chemistryInferred by TeaHQ, not established

   Check: Do you live in a hard-water area, and does the cup look dull or have a film on the surface?

   Fix: Try filtered water. Hard water flattens green tea noticeably and can produce a dull, slightly metallic cup. This is a real effect, though a smaller one than temperature.

Tea types this applies to

• Green tea

Brewing methods this applies to

• Western brewing (teapot or mug) — A small amount of leaf in a large volume of water, steeped once for a few minutes and then strained off. The approach most English-speaking drinkers already know, and the one most teas sold in the West are made for.

Guides covering this

• Why tea tastes bitter — Almost always the water was too hot, and almost always the fix costs nothing. Bitterness and astringency are also different problems with different causes, and running them together fixes one and leaves the other.
• Water temperature, and why it matters more in tea than in coffee — Temperature is the single most consequential variable in tea brewing, and the one most often got wrong. It is also the easiest to fix without buying anything.
• Bitterness vs astringency explained — One is a taste and one is a physical sensation. They have different causes and different fixes, and almost all confusing tea advice comes from treating them as one thing.
• Kettles, and getting to temperature — A variable-temperature kettle removes the most common brewing error. It is also entirely optional, and three free methods get you close enough that the difference is hard to taste.
• The mistakes that make tea taste bad — Almost all disappointing tea is one of six errors, and five of them cost nothing to fix. None of them is buying the wrong tea, which is where most people start looking.
• Oxidation level does not set the brewing temperature — The tidiest rule in tea — more oxidised means hotter water — is a rough correlation dressed up as a law, and following it strictly will ruin several well-known teas.
• Reading processing faults in the cup — A surprising amount of what a drinker experiences as not liking a tea is a specific, nameable manufacturing error. Learning to hear the difference between a fault and a style is the fastest way to stop blaming yourself for a disappointing cup.
• The five things a tongue reports, and where each comes from in tea — Taste proper is a short list — sweet, bitter, sour, salty, umami — and tea is unusual in delivering four of them noticeably and the fifth almost never. Sorting a cup into these five is the first step to describing it usefully.
• Astringency is something you feel, not something you taste — Bitterness is registered by the tongue as a taste. Astringency is a physical sensation across the whole mouth — a drying, tightening, roughening. They have different causes, different fixes, and confusing them makes most tea troubleshooting advice fail.
• “Boiling water ruins green tea” is over-stated — The most repeated rule in English-language tea writing is a useful default badly explained. What goes wrong at the top of the range is a combination of decisions, and temperature is only one of them.
• How brewing changes which descriptors appear — The same leaf produces different tasting notes at different temperatures, ratios and times, and the differences are not small. A note without its parameters describes an event rather than a tea, and knowing which lever moves which descriptor is most of practical tasting.

Related problems

Sharing a cause category, a tea type or a brewing method with this one.

• My green tea tastes flat and looks dark in this house — A delicate green tea that tasted bright elsewhere comes out dull and heavy here, with a darker, browner liquor than it should have and none of its aroma.
• I bought a water filter for my tea and it changed nothing — A filter jug or tap filter was bought specifically to improve the tea, and the cup tastes the same as it did before — with the same dullness, the same film and the same scale in the kettle.
• My Japanese green tea tastes of seaweed or fish — A sencha, gyokuro or matcha reads as marine — seaweed at best, distinctly fishy at worst — and it is not clear whether that is the tea or a fault.
• My tea gets drier and harsher as it cools — The first mouthful is balanced and the last one, several minutes later, grips the tongue and feels rough — from the same cup, with nothing added.
• My tea is drying and puckering rather than bitter — The tea makes the mouth feel dry and rough, gripping the tongue and cheeks, without necessarily tasting bitter.

Sources