How to Choose and Brew Every Type of Tea: A Complete Guide

Tea drinkers often assume that green, black, white and oolong teas are different plants or blends. According to the UK Tea & Infusions Association (UKTIA), true tea comes only from Camellia sinensis; herbal and fruit infusions, by contrast, are not technically tea at all because they are not derived from that plant.

What separates one tea category from another is oxidation — the degree to which the picked leaf is exposed to air before it is dried or fired. The UKTIA's own description of tea processing lists white tea as the least processed, green tea as unoxidized, oolong as partially oxidized (from roughly 10% to nearly 80%, depending on the style), black tea as fully oxidized, and pu-erh (dark tea) as fermented, sometimes for years, after initial processing.

Why water temperature matters

Delicate, lightly processed leaves such as white and green tea scorch easily; water that is too hot pulls out bitter compounds before the leaf's own flavor develops. More oxidized leaves, such as black tea, are sturdier and need near-boiling water to open fully. Tea retailer Harney & Sons and the specialty retailer Artful Tea both publish steeping charts built on this principle, though their exact numbers vary slightly by a few degrees or minutes — a normal range given differences between specific tea cultivars and leaf grades.

Steeping guide by tea type

The ranges below combine recommendations from the UK Tea & Infusions Association, Harney & Sons and Artful Tea. Where the sources differ, the table shows the range actually reported, and single-source figures are noted as such.

The UKTIA gives its own figures specifically for black and green tea: black tea at 90–98°C and green tea at around 80°C, brewed for roughly 3–4 minutes for a standard black tea, though it advises checking the specific instructions on the tea's own packaging, since steep times for individual teas such as sencha (about 2–2.5 minutes) or Assam (3–4 minutes) can be shorter or longer than the general category range.

Step-by-step brewing method

1. Start with freshly drawn water. The UKTIA notes that water loses dissolved oxygen if it is boiled more than once, which can flatten the flavor of the tea, so only boil the amount you need.
2. Measure the leaf. UKTIA recommends one tea bag or one rounded teaspoon of loose tea per cup; Artful Tea's chart is similar, suggesting roughly one teaspoon of loose leaf per 6 oz of water for green, oolong and black tea, and about two teaspoons for white tea.
3. Heat the water to the temperature that matches the tea category in the table above. An electric kettle with a temperature setting removes the guesswork; without one, remember that fully boiled water starts at around 212°F/100°C and gradually cools the longer it sits off the heat.
4. Pour the water over the leaf in a teapot, infuser or filter that gives the leaves room to expand, and start timing immediately.
5. Remove the leaves or tea bag once the steeping time in the table is reached. Artful Tea's guide notes that oversteeped leaves release bitter compounds, while understeeped leaves produce a thin, weak cup.
6. If adding milk, the UKTIA's guidance is to add it last, after the bag or leaves have been removed, though it adds that the order is ultimately down to personal taste.
7. Store unused tea in a cool, dry place away from strongly flavored or perfumed foods, according to the UKTIA.

Matcha is brewed differently

Matcha is not steeped and strained like other green teas. Because it is a powdered whole leaf whisked directly into hot water, the drinker consumes the entire leaf rather than only the compounds that diffuse out during steeping, according to Artful Tea. Artful Tea recommends roughly 175°F water for whisking matcha, well below the near-boiling water used for black tea.

How caffeine content compares

Caffeine levels vary by tea type, but the ranges overlap more than many drinkers expect. Art of Tea's caffeine guide lists approximate ranges per 8-ounce cup: white tea 15–45 mg, green tea 20–45 mg, oolong 30–50 mg, pu-erh 30–70 mg, black tea 40–70 mg, and matcha 60–80 mg. Most herbal infusions, such as chamomile or peppermint, are naturally caffeine-free, but the UKTIA notes that some — including yerba mate or blends containing guarana or cola nut — do contain caffeine.

Art of Tea attributes black tea's generally higher caffeine content partly to full oxidation, which breaks down the leaf's cell structure and makes caffeine easier to extract, and partly to the hotter water and longer steep times typically used for black tea. The source also notes that leaf form, the amount of leaf used, water temperature and steep duration all push the final caffeine count up or down within each category, so a strongly steeped green tea can contain more caffeine than a lightly steeped black tea.

Choosing a tea type to start with

• For a mild, low-intensity cup, white or green tea brewed briefly in cooler water suits most new tea drinkers, according to the UKTIA and Artful Tea's category descriptions.
• For a cup closer to coffee in strength, black tea brewed at near-boiling water for the full 3–5 minutes gives the most fully extracted flavor.
• For something in between, oolong's wide oxidation range (10–80%, per UKTIA) means individual oolongs can taste closer to green or closer to black tea, so checking the specific product's instructions matters more than for other categories.
• For a tea with less caffeine, most herbal and fruit infusions such as chamomile or peppermint are naturally caffeine-free, though the UKTIA notes that some — such as yerba mate or blends containing guarana or cola nut — do contain caffeine.