Why is my matcha bitter?
Updated By Mio.KShare
You read that boiling water was the problem, so you let the kettle stand. Still bitter. You used less powder. Still bitter. By the fourth bowl you are changing two things at once and no longer know which one mattered.
Bitterness in matcha has a few common causes, and they do not feel the same in the mouth. You can separate them in a single bowl by asking three questions: is the bitterness even from sip to sip, does it dry your mouth or only taste bitter, and does it arrive in front of the sweetness or behind it. Each answer points at one cause, and then you change one thing.
Every guide I have read gives the same list — water too hot, too much powder, poor quality, old tin — and then leaves you to try them in whatever order occurs to you. The list is right as far as it goes, and it leaves out the one that decides most bowls: how it was whisked. The trouble is that it is a list. What follows is how to tell which one is yours.
Some bitterness belongs in the bowl
Thin tea is not meant to be sweet. Matcha carries sweetness and bitterness together, and a good bowl has both: the sweetness landing first, the bitterness sitting behind it and giving the tea its length. A bowl with no bitterness at all is usually weak, or made with water too cool to draw anything out.
So the target is not the absence of bitterness. It is the order of arrival. When people tell me their matcha is bitter, what they nearly always mean is that the bitterness came first and stayed, and the sweetness never arrived at all. That is a fault, and it is fixable — but it is a different thing from bitterness as such, and starting from that distinction saves you from chasing away a flavor that was always supposed to be there.
Three questions that separate the causes
First: is it even from sip to sip?
Drink a third of the bowl. Wait. Drink another third. If some mouthfuls are sharply bitter and others are fine, the powder is not properly in suspension. There are clumps in there, and a clump is a concentrated pocket of matcha that meets one sip and not the next.
Matcha is stone-ground finer than flour, and it compacts under its own weight in the tin. A whisk pushes lumps around the bowl rather than breaking them, so whisking harder or longer will not fix this — and whisking harder is exactly what most people do when a bowl tastes uneven. Press the powder through a fine mesh before the water goes in. It takes about twenty seconds and it removes the problem completely. I have set out what to sift with and how much it matters separately, including the case for using a tea strainer you already own.
Second: does it dry your mouth, or only taste bitter?
This is the question nobody asks, and it is the most useful one on the page. Bitterness is a taste. Astringency is a feeling — the puckering, drying, faintly rough sensation of an over-steeped black tea or a young red wine. They come from different places and they point at different causes.
If the tea tastes bitter but your mouth stays comfortable, the problem is in the preparation: the water, the ratio, or the clumps. All three are free to fix. If the tea dries and roughens your mouth, the problem is usually the powder itself, and no adjustment at the bowl will rescue it.
The reason sits in how matcha is grown. Shading the plants for several weeks before picking raises the amino acids that give matcha its savory roundness and holds back the compounds that read as harsh and drying. Leaf grown in full sun never had that balance, and powder milled from it will be astringent however carefully you make it, and it will not give you the late sweetness a shaded tea does: what matcha is supposed to taste like. Age does the same thing from the other direction: matcha oxidizes once the tin is opened, fastest in warmth and light, and old powder turns from vivid green toward olive, smells of hay rather than cut grass, and goes flat and drying rather than round. If your tin has been open more than a month or two at room temperature, rule that out before you touch anything else — how you store it matters more than most people expect.
Third: is it even, comfortable, and still bitter first?
If the bitterness is even, it is not clumps. If your mouth is not drying, it is not the powder. That leaves the two things you control at the bowl — how hot the water was, and how much powder was in it — and the foam tells you which.
Coarse bubbles that collapse within seconds are a whisking problem, not a temperature problem. The foam is made by the whisk moving fast enough to shear the powder into the water, and a slow or shallow hand leaves large bubbles and, in the same motion, pockets of powder that never dispersed. That is what you are tasting. Bitter tea under a fine, stable foam, in a bowl that feels thick and almost muddy in the mouth, is a ratio problem: too much powder for the water. The two faults are easy to confuse because both taste bitter, and they need opposite corrections.
| What you notice | Most likely cause | What to change |
|---|---|---|
| Some sips bitter, others fine; beads of powder at the bottom | Clumps | Sift the powder before the water. Nothing else |
| Mouth feels dry and rough afterward; color dull, smell of hay | Old powder, or sun-grown leaf | Change the matcha. Preparation cannot fix this |
| Even bitterness, big bubbles, foam gone in seconds | Whisking | Whisk faster from the wrist, in a W through the bottom of the bowl, then slow to break the coarse bubbles |
| Even bitterness, good fine foam, thick and heavy in the mouth | Too much powder for the water | 2 g to 60–70 ml, weighed once so you know what it looks like |
| Bitter and thin, with almost no foam at all | Too much water, or a tired whisk | Less water first; then look at the whisk |
Change one thing at a time, cheapest first
The order matters, because two of these cost nothing and one of them costs the price of a new tin. Sift first — it is free if you own a tea strainer, it takes twenty seconds, and it is the most common cause I see. Then fix the whisking, which is also free: faster from the wrist, in a W through the bottom of the bowl, for fifteen to twenty seconds. Then weigh the powder once, so that you know what two grams looks like on your own scoop, and go back to the scoop afterward. Only when all three are settled is it fair to blame the matcha.
Give each change its own bowl. If you sift and drop the temperature in the same bowl and it comes out better, you have learned nothing you can repeat.
Where the advice disagrees, and what I do
You will find recommended temperatures anywhere from 65 °C to just off the boil, and the disagreement is real rather than careless. Cooler water gives more of the savory roundness and less bitterness; hotter water gives a livelier foam and more length. I use water straight from the kettle, just off the boil, which is what a tea room does — and the tea there is not bitter. What carries that is the amount and the whisking, not the thermometer. So if bitterness is the problem you are trying to solve, I would put the kettle fourth, after the sifting, the whisking and the amount. There is a fuller account of where the 70 to 80 °C figure actually comes from, including why boiling water is not dangerous.
When it really is the powder
I sell matcha, so weigh what follows accordingly. If the mouth-drying test points at the tin, the words printed on it will not help you decide what to buy instead: "ceremonial grade" is unregulated in every market and means whatever the seller wants it to mean, which I have gone into at length in an honest answer about grade labels. What does carry information is the origin, the harvest, and the date the tin was filled. A named growing region, a first harvest, and a recent milling date tell you more than any adjective, and the tests that actually work are ones you can run on the powder in front of you.
Questions I get asked
Is matcha supposed to be bitter at all?
Yes, a little, and behind the sweetness rather than in front of it. Bitterness gives thin tea its length, and a bowl with none is usually weak or made with water too cool. What you are trying to remove is bitterness that arrives first and stays.
Why is my matcha bitter even after cooling the water?
Then it was never the water. Look at the whisking, the amount and the clumps. Too much powder for the water is bitter at any temperature, and unsifted lumps carry concentrated pockets that make some sips much worse than others. Two grams to 60–70 ml, sifted, and see where you are.
Does adding milk or sweetener fix bitter matcha?
It covers it rather than fixes it, which is a perfectly reasonable thing to want on a weekday. But if the powder is astringent from age or sun-grown leaf, milk will not hide the drying feeling, only the taste, and you will find yourself adding more each time.
Can whisking too long make matcha bitter?
Not in itself. Whisking does not extract anything further; it suspends what is already there and builds foam. If long whisking seems to make things worse, what is usually happening is that the water is cooling past the point where the foam holds, so the bowl tastes flatter and the bitterness stands out more.
My matcha is bitter only at the bottom of the bowl. Why?
Powder settling out of suspension, which is the same clump problem arriving late. Sift before you whisk, and drink the bowl within a minute or two rather than letting it stand. If what you are noticing is texture rather than taste, powdery matcha has its own short list of causes.
Where this fits
If you want to rule out the powder without spending much, the two-tin starter pairs one matcha meant for whisking with an everyday one for milk, which is the quickest way to learn what your own bitterness is actually coming from. The furui is $30 and the least interesting object in the shop; a fine tea strainer does the same job. If the trouble is a fishy or oily note rather than bitterness, that has different causes. For everything else around making a bowl, start with the complete beginner's guide.
And if the problem is the opposite — that it tastes of almost nothing at all — that is usually the milk.
Written by Mio.K, who chooses everything in this shop by hand in Japan.