Why Is My Tea Bitter?

A cup of tea that tastes harsh, sharp or leaves your mouth feeling dry has usually given up more of its tannins and catechins than you wanted. Those compounds are part of tea's appeal in small amounts. They give black tea its brisk snap and green tea its clean finish, but they build up quickly when leaves sit too long, steep too hot or are packed too densely.

It helps to separate two sensations. Bitterness is a taste on the tongue. Astringency is the rough, drying, puckering feel on your gums and cheeks. Over-steeping causes both. Water that is too hot for delicate teas mostly adds bitterness, while very strong black tea leans toward astringency. Knowing which one you are tasting points you to the fix.

Over-steeping is the usual cause

Flavor and aroma compounds come out of the leaf first, within the first minute or two. Tannins and the more bitter catechins keep coming long after that. A tea that tasted lovely at three minutes can turn harsh at seven, and a bag forgotten in a mug for a quarter of an hour will be rough no matter what tea it is.

Use a timer for a week and notice where your favorite tea peaks. Then shorten the steep by 30 seconds and see whether it tastes rounder. Many people find they have been brewing a minute or two longer than they need to.

• Black tea: 3 to 5 minutes at 95 to 100°C (203 to 212°F)
• Oolong: 2 to 4 minutes at 85 to 95°C (185 to 203°F)
• Green tea: 1 to 3 minutes at 70 to 80°C (160 to 175°F)
• White tea: 2 to 4 minutes at 75 to 85°C (167 to 185°F)

Water that is too hot for the tea

Green and white teas are processed to keep their delicate, sweet character, and boiling water strips it away quickly, leaving a bitter, vegetal brew. Black tea and most herbal infusions handle full-boil water well because they need the heat to open up.

Without a variable kettle, let boiled water stand uncovered for about two minutes for oolong and white tea, and three to four minutes for green tea. Pouring into a room-temperature cup or pitcher first also knocks a few degrees off.

Too much leaf for the water

A general starting point is about 2 to 3 g of loose leaf, roughly one teaspoon of dense tea or a heaped tablespoon of fluffy leaf, per 240 ml (8 oz) of water. Doubling the leaf to get a stronger cup also doubles the tannin load.

For a stronger cup with less harshness, add a little more leaf but keep the steep at the shorter end of the range. That gives more body and flavor without the long tail of astringency that a long steep pulls out.

Why tea bags turn bitter faster

Most standard tea bags contain fannings and dust, which are tiny broken pieces of leaf. Their huge surface area means they extract in a fraction of the time whole leaves take, so they can tip from strong to bitter within a couple of minutes.

Squeezing the bag against the spoon pushes out the last, most concentrated and most tannic liquid. Lift it out and let it drip briefly instead. Pyramid bags with larger leaf pieces behave more like loose tea and give you a wider margin.

Leaves left sitting in the pot

If you brew a pot and pour cups over twenty minutes, the last cup will be much harsher than the first because the leaves never stopped working. Use an infuser basket you can lift out, or decant the whole brew into a second warmed pot or thermos as soon as the steep ends.

Water quality and other quieter causes

Very hard water can make black tea taste dull and harsh and leaves a film on the surface. Water that has been boiled repeatedly loses oxygen and can make tea taste flat. Fresh, filtered cold water heated once gives the cleanest flavor.

Some teas are simply bold. Assam, strong breakfast blends and gunpowder green are meant to be brisk, and they are often served with milk, sugar or mint for that reason. If a gentle cup is what you want, a Darjeeling, a Chinese black tea or a Japanese sencha brewed cool may suit you better.

Rescuing a bitter cup

Splash in milk for black tea; milk proteins bind some of the tannins and soften the drying feel. A little sugar or honey masks bitterness. Diluting with hot water helps a cup that is merely too strong. For big batches of iced sweet tea, a very small pinch of baking soda in the pitcher is a common Southern trick that smooths harshness, but it will not save tea that tastes burnt.

Common questions

Why is my green tea bitter even when I steep it briefly?

Water temperature is the most likely cause. Boiling water makes green tea bitter within seconds. Cool the water to about 70 to 80°C (160 to 175°F), use a little less leaf, and try a steep of 1 to 2 minutes.

Does adding lemon make tea less bitter?

Lemon adds brightness and can distract from bitterness, but its acid can make astringency feel sharper in strong black tea. Milk is the better softener for brisk black teas, while lemon works best in lighter, well-brewed cups.

Can I re-steep leaves without the second cup turning bitter?

Yes, many whole-leaf oolongs and green teas brew well two or three times. Keep the water at the same temperature and lengthen each steep slightly, by about 30 seconds to a minute. Bagged tea rarely gives a good second cup.