Why is my tea bitter?
Tea turns bitter when too many catechins and too much caffeine end up in the cup. The usual culprits, in order: water that is too hot (especially for green tea), steeping too long, using too much leaf, or leaving the leaves in. For green tea, drop to 70–80 °C (158–176 °F) and steep 1–2 minutes; for black tea, keep it to 3–4 minutes and strain completely.
What makes tea bitter in the first place
Tea leaves contain two groups of compounds that taste harsh when overdone. Catechins, the main polyphenols in green tea, bring bitterness and the drying, mouth-puckering feeling called astringency. Caffeine is bitter too. Both dissolve faster in hotter water, and both keep coming out the longer the leaves sit. The sweet, savoury amino acids that make green tea pleasant (L-theanine is the best known) dissolve readily even in cooler water. That is why lower temperatures shift the balance towards sweetness: you still get the good stuff, but less of the harsh stuff.
So bitterness is not a defect of the tea. It is a dial you control with three numbers: temperature, time and amount.
The 7 most common causes
| Cause | What happens | Fix |
|---|---|---|
| Water too hot | Boiling water pulls catechins out of green and white tea fast | Green 70–80 °C (158–176 °F), white 80–85 °C (176–185 °F) |
| Steeped too long | Bitterness keeps building after the flavour has peaked | Use a timer; green 1–2 min, black 3–4 min |
| Too much leaf | High leaf-to-water ratio makes everything stronger, bitterness included | Weigh: about 1 g per 60–80 ml |
| Leaves left in | The tea keeps steeping in the pot or mug | Strain fully, or remove the bag or infuser |
| Squeezed tea bag | Pressing forces out the last, most astringent liquid | Lift the bag out and let it drip |
| Broken leaf / dust | Small particles have more surface and extract very quickly | Shorten time by a third for bags and CTC tea |
| Stale or low-grade tea | Flat sweetness leaves bitterness exposed | Buy smaller amounts, store airtight and dark |
Why green tea goes bitter so easily
Green tea is not oxidised, so its catechins are still in their original, sharper form. In black tea, oxidation has turned many of them into theaflavins and thearubigins, which taste rounder. That is why black tea tolerates boiling water and green tea does not. A Japanese sencha poured with water straight off the boil and left for four minutes will taste harsh almost every time; the same leaves at 70 °C (158 °F) for one minute can be sweet and brothy.
Our green tea guide has exact numbers by style. For Japanese steamed greens, see how to brew sencha; for pan-fired Chinese greens, Dragon Well.
Bitter black tea
Black tea bitterness usually comes from time and dose, not temperature. Broken-leaf breakfast tea and most bags give up their flavour in 2–3 minutes; after five, they become stewed and tannic. If you take milk, a stronger, shorter brew works better than a longer one. Whole-leaf teas like a good Assam or Ceylon can go to 4 minutes. See the black tea guide.
How to rescue a bitter cup
- Dilute it. Over-strong tea topped up with hot water is often perfectly drinkable, because the problem is concentration.
- Add milk to black tea. Milk proteins bind some of the polyphenols and soften astringency.
- Use it cold. Over-steeped tea can be chilled, diluted and served over ice.
- Change one thing next time. Lower the temperature by 5 °C first, then shorten the time. Changing everything at once tells you nothing.
Is it the water?
Very hard water can make tea taste dull and harsh and leave a film on black tea. If your tea is bitter even with correct numbers, try filtered water or a low-mineral bottled water once to compare. And use freshly boiled water rather than water that has been reboiled several times.
A quick diagnostic
- Measure the leaf with the brew calculator.
- Check the water temperature, or use our no-thermometer methods.
- Set a timer and strain completely when it rings.
- Still bitter? Reduce time by 30 seconds per cup until it isn’t.
Usually step 2 is the culprit. If you re-steep, see how to resteep tea for how timings change on later infusions.
Frequently asked questions
Why is my green tea bitter?
Usually because the water is too hot or the steep is too long. Green tea’s catechins dissolve quickly in boiling water. Use 70–80 °C (158–176 °F) water and steep for 1–2 minutes, then strain completely.
Does steeping tea longer make it bitter?
Yes. Bitterness and astringency keep building as the leaves sit in water. Most flavour is extracted in the first few minutes, so extra time mainly adds harshness.
Should you squeeze a tea bag?
It is better not to. Squeezing pushes the most concentrated, astringent liquid out of the bag. Lift it out and let it drip for a second instead.
How do you make bitter tea taste better?
Dilute it with hot water, add milk to black tea, or chill it for iced tea. Next time lower the temperature or shorten the steep.