Share
Why Does Matcha Taste Bitter? 8 Causes & How to Fix Them
Matcha naturally has some bitterness and astringency, but harsh, unpleasant bitterness is often caused by preparation, freshness or the matcha itself. Here is how to tell the difference—and make a smoother cup.
Good matcha is not necessarily completely free of bitterness. A slight bitter or astringent edge can be part of green tea's natural flavour. What you do not want is a cup that tastes aggressively bitter, drying, burnt or harsh.
Matcha taste comes from the balance between several naturally occurring compounds. Catechins and caffeine can contribute bitterness and astringency, while amino acids such as theanine and glutamate contribute sweetness and umami.
If your matcha suddenly tastes much more bitter than expected, the cause may be as simple as water that is too hot, too much powder, too little water or stale matcha.
Why does matcha taste bitter?
The most common reasons are:
Very hot water can make green tea taste sharper and can exaggerate bitter or astringent notes.
Increasing grams without increasing water makes every flavour component more concentrated—including bitterness.
Harvest, shading, leaf selection, cultivar and processing all affect the balance of umami, sweetness, bitterness and astringency.
Air, heat, light, moisture and odors can flatten aroma and make an old matcha seem harsher or less balanced.
Mineral content and chlorine can change how tea tastes. Soft, good-tasting water is usually preferable for Japanese green tea.
Poor whisking does not create bitter compounds, but dry clumps can give you concentrated pockets of matcha that taste unusually strong.
Bitterness vs astringency: they are not the same thing
People often call every unpleasant tea sensation “bitter,” but bitterness and astringency are different.
| Sensation | What it feels like | Common description |
|---|---|---|
| Bitterness | A taste detected on the tongue | Sharp, bitter, intense |
| Astringency | A drying or puckering mouthfeel | Dry, rough, mouth-tightening |
| Umami | Savoury depth and fullness | Brothy, rounded, rich |
| Sweetness | Softens the overall profile | Gentle, mellow, round |
Tea catechins are important contributors to bitterness and astringency, while caffeine also contributes bitterness. The balance of these compounds with amino acids strongly influences how smooth or harsh a matcha tastes.
The goal is balance—not a completely flavourless matcha. A premium matcha can still have a gentle bitter finish while remaining sweet, umami-rich and pleasant.
Cause #1: your water is too hot
This is one of the easiest problems to fix. Japanese tea makers generally recommend cooling boiled water before whisking matcha rather than pouring aggressively boiling water directly onto the powder.
Marukyu Koyamaen's preparation guide uses approximately 70–85°C water depending on season and preference for a traditional bowl of matcha.
For an everyday Blendit-style preparation, a useful starting point is around 70–80°C. If your cup tastes harsh, test the same matcha with slightly cooler water before deciding the powder itself is the problem.
| Water temperature | Likely effect | Best use |
|---|---|---|
| Boiling / near-boiling | Can taste sharper and more aggressive | Usually avoid for premium matcha |
| About 70–80°C | Good balance of flavour and warmth | Strong everyday starting point |
| Cooler water | Can emphasize sweetness and soften bitterness | Useful for naturally bolder matcha |
| Cold water | Fresh, lighter extraction experience | Iced matcha and cold preparation |
Cause #2: you are using too much matcha for the amount of water
A strong matcha is not automatically a better matcha. If you increase the powder but keep the water amount unchanged, bitterness, astringency and caffeine all become more concentrated.
Traditional recipes vary. Marukyu Koyamaen gives approximately 1.5 g matcha with 70 ml water as one preparation guideline. Many modern preparations use around 2 g.
A practical starting point is:
- Start with about 2 g of matcha.
- Use roughly 60–80 ml water for straight matcha.
- Use water around 70–80°C.
- Whisk until evenly dispersed.
- If it tastes too strong, add a little more water before adding sweetener.
If your matcha is bitter, do not immediately change the powder amount, water volume, temperature and milk at once. Lower the water temperature first, taste again, then adjust the ratio if needed.
Cause #3: the matcha is naturally more bitter
Some matchas are naturally bolder and more astringent than others. “Matcha” describes a category, not one single flavour profile.
Quality is influenced by the raw leaf material, shading, harvest timing, stem and vein removal, processing, milling, cultivar, growing region and freshness.
Research comparing matcha grades notes that higher-quality drinking matcha is typically associated with careful shading, younger spring leaves and processing choices designed for a smoother sensory profile. Later harvest material is commonly used for food-grade matcha, where a stronger flavour may be useful in recipes.
A matcha can be authentic Japanese tea and still have a more bitter profile. The question is whether the flavour matches the intended use and the quality you were expecting.
For broader quality checks, read How to Tell if Matcha Is High Quality .
Cause #4: harvest, shading and leaf chemistry affect bitterness
Shading is one of the defining steps in matcha production. Research shows that shading can increase amino acids such as theanine while reducing several catechins. That shift helps create the umami-rich, smoother profile associated with good matcha.
Tea polyphenols—particularly catechins—are major contributors to bitterness and astringency. Amino acids contribute sweetness and umami. The balance between them matters more than any one compound by itself.
Proper shading generally supports amino-acid retention and the characteristic matcha profile.
Premium drinking matcha often uses younger spring-harvest material.
Different Japanese tea cultivars naturally express different levels of umami, sweetness, aroma, bitterness and astringency.
Region alone does not determine taste. Farm practices, weather and processing also matter.
This is why two high-quality matchas can both be excellent yet taste noticeably different.
Compare origin profiles in Uji vs Kagoshima Matcha .
Cause #5: your matcha has lost freshness
Freshness affects the balance of a cup. Matcha exposed repeatedly to air, heat, light or moisture may lose bright aroma and taste flatter or harsher over time.
Signs that quality may be fading include:
- A noticeably weaker fresh-tea aroma.
- Colour becoming duller or more olive than when first opened.
- Less sweetness or umami.
- A flatter or more stale finish.
- Matcha that tastes harsher despite using the same preparation method.
Read How to Store Matcha Properly: 7 Storage Mistakes to Avoid and How Long Does Matcha Last? .
Cause #6: your water changes the flavour
Water is most of the finished drink, so poor-tasting water can make even good matcha disappointing.
Marukyu Koyamaen recommends soft water for Japanese green tea and notes that different waters can change tea colour, aroma and taste.
- Use fresh drinking water that tastes good on its own.
- Filtered water can help when tap water has a strong chlorine taste.
- Very hard mineral water can change the cup noticeably.
- Test the same matcha with another water source before judging the tea.
Prepare the same matcha, same grams and same temperature twice—once with your normal water and once with softer filtered or bottled water. The difference can be surprisingly obvious.
Cause #7: clumps make the cup taste uneven
Whisking technique does not magically remove the naturally bitter compounds in matcha. What it does is disperse the powder evenly so you do not drink concentrated dry clumps.
Sifting is especially helpful because fine matcha naturally clumps. Marukyu Koyamaen specifically recommends sifting before whisking so the powder disperses more easily.
- Use a completely dry bowl and sifter.
- Sift the measured matcha into the bowl.
- Add cooled hot water.
- Mix gently first to wet the powder.
- Whisk quickly back and forth rather than stirring in slow circles.
- Stop once the matcha is evenly dispersed with a fine foam.
A good chasen helps create even dispersion and finer foam. A damaged or very stiff whisk may make preparation harder, but the whisk does not create bitterness in the matcha powder.
Why does my matcha latte still taste bitter?
Milk softens matcha, but it cannot completely hide a very harsh tea or a badly balanced recipe.
| Problem | Likely cause | Try this |
|---|---|---|
| Latte tastes harsh even with milk | Matcha dose too high or matcha naturally bold | Reduce powder slightly or use more milk |
| Hot latte tastes more bitter than iced | Water or milk preparation is too hot | Use cooler water for the matcha base |
| Sweetener is needed just to hide bitterness | Preparation or matcha may be mismatched | Fix temperature and ratio before adding more sugar |
| Powdery bitter pockets | Matcha not sifted or dispersed | Sift and whisk the matcha base first |
| Latte became harsher weeks after opening | Freshness may be declining | Review storage and compare with a fresh pack |
A latte-oriented matcha can have a slightly stronger flavour than a matcha intended primarily for drinking straight, because it must remain noticeable through milk.
How to make bitter matcha taste smoother
If the matcha itself is good but your cup tastes too bitter, troubleshoot in this order:
- Lower the water temperature to around 70–80°C.
- Measure your matcha instead of estimating by eye.
- Start around 2 g rather than making an unnecessarily concentrated bowl.
- Use enough water—roughly 60–80 ml is a useful starting range.
- Sift the powder before adding water.
- Whisk until evenly dispersed.
- Test with soft, clean-tasting water.
- Check how long the matcha has been open and how it was stored.
- If it is still harsh, compare it with another matcha intended for drinking straight.
Sweetener can mask bitterness, but if boiling water, poor storage or an overly concentrated recipe is the real problem, correcting the preparation will usually produce a better cup.
Should good matcha taste completely non-bitter?
No. “Zero bitterness” is not a reliable definition of quality. High-quality matcha is usually valued for balance: sweetness, umami, aroma, body and a controlled level of bitterness or astringency.
Different cultivars and styles can be naturally sweeter, more savoury, more aromatic or slightly more structured. A matcha can therefore be excellent without tasting identical to another premium matcha.
If you are new to matcha and want a smoother starting point, read Best Matcha for Beginners .
A smoother cup starts with the right matcha—and the right technique
Explore Blendit's Japanese matcha and learn how origin, preparation, freshness and quality change the way your matcha tastes.
Matcha bitterness FAQs
Why is my matcha so bitter?
Common causes include water that is too hot, too much powder for the water volume, a naturally bolder matcha, declining freshness or water that changes the flavour.
Is bitter matcha low quality?
Not automatically. All matcha contains compounds that can contribute bitterness. However, harsh bitterness with little sweetness or umami may indicate a preparation problem or a matcha less suited to drinking straight.
What temperature makes matcha less bitter?
Around 70–80°C is a useful starting range for a smooth everyday matcha. Japanese tea makers commonly recommend cooling boiled water before whisking matcha.
Does boiling water make matcha bitter?
Very hot water can make green tea taste sharper and can emphasize bitter or astringent sensations. Let boiling water cool before preparing premium matcha.
Does whisking make matcha less bitter?
Whisking does not remove bitter compounds, but good whisking and sifting distribute the powder evenly and prevent concentrated dry clumps.
Why does my matcha taste bitter after a few weeks?
Freshness may be declining, especially if the powder was exposed to heat, light, moisture or air. Compare the aroma and flavour with a freshly opened pack and review your storage method.
Why is my iced matcha less bitter than my hot matcha?
Temperature changes taste perception, and cooler preparation can produce a softer experience. Your hot version may also be using water that is hotter than necessary.
How many grams of matcha should I use for a smooth cup?
Around 2 grams is a practical modern starting point. Use roughly 60–80 ml of water for straight matcha, then adjust according to the particular matcha and your preference.
Why is my matcha bitter even with milk?
The matcha may be too concentrated, the preparation may be too hot, or the tea may naturally have a stronger bitter profile. Adjust the matcha-to-liquid ratio before relying on extra sweetener.
Final thoughts
Matcha should have character, but it should not automatically taste harsh. A small amount of bitterness can be normal; aggressive bitterness is a reason to check your preparation and the tea itself.
Start by lowering the water temperature, measuring the powder and using enough water. Then check freshness, storage and water quality. If those variables are controlled and the matcha still tastes harsh, you may simply prefer a smoother cultivar or a higher-quality matcha intended for drinking straight.
Sources and further reading
- Marukyu Koyamaen — Preparation of Matcha
- National Library of Medicine / PMC — Matcha as a Source of Bioactive Compounds
- National Library of Medicine / PMC — Health Benefits and Chemical Composition of Matcha Green Tea
- National Library of Medicine / PMC — Characterization of Different Grades of Matcha Tea
Blendit shares practical Japanese matcha education, preparation guidance, smoothie recipes and everyday wellness inspiration.