How to Judge Tea Quality: Dry Leaf, Aroma, Liquor, Taste and Spent Leaf

You can judge tea quality yourself in five steps. Dry leaf: whole, even, clean, with a natural sheen and no dust, stems or foreign bits. Aroma: clean and specific, never musty, smoky (unless it should be) or perfumed. Liquor: clear and bright, not cloudy or dull. Taste: clean, with sweetness and a pleasant aftertaste; bitterness, if any, should turn sweet quickly.

Spent leaf: whole, supple, even in colour. Two extra tests reveal a lot: brew the tea with a long steep (good tea stays pleasant) and count how many steeps it lasts.

I'll be honest: for years I judged tea by the label, the price tag and the story. It took a patient tea friend to show me the simplest trick: spread out the spent leaves on a white plate after a session. My "premium" Tieguanyin was a mess of broken pieces and stems; a humble one I'd almost ignored was all whole, supple leaves. It was also the better cup. Since then I look at the leaves before I trust the label.

The five-step check#

Step 1: dry leaf#

Pour a few grams onto white paper.

• Evenness: leaves of similar size, shape and colour show careful sorting.
• Wholeness: whole leaves and buds brew slowly and cleanly; crumbs extract fast and turn bitter.
• Cleanliness: few stems (unless the style calls for them), no dust, no foreign material. After production, good tea is often picked over by hand; the dust often goes into tea bags.
• Sheen: a natural gloss is a good sign in many teas; dull, grey leaf suggests age or poor storage.

For pu-erh cakes: even colour and density, whole leaf, a stated production date, and no brand-new wrapper on a supposedly old cake. See fake pu-erh.

Step 2: aroma#

Smell the dry leaf, then the wet leaf in a warm gaiwan, then the empty cup. Good tea smells clean and specific: you can name what you smell. Warning signs: mustiness (damp storage), a flat, dusty smell (old tea), heavy perfume (flavouring), or smoke in a tea that shouldn't be smoky.

Step 3: liquor#

Clear and bright is the rule. Some cloudiness is normal in bud teas with lots of down. Dull, muddy or oily-looking liquor suggests poor processing or old tea. Colour alone says little about quality, especially for pu-erh.

Step 4: taste#

• Clean: no mustiness, no off notes.
• Sweetness: in the taste or in the aftertaste.
• Texture: good tea often feels thick and smooth.
• Bitterness: acceptable if it turns sweet in the throat within seconds (hui gan); a warning if it lingers.
• Aftertaste: a good tea stays with you for minutes.

Pu-erh drinkers use words like smooth, pure, thick, soft, sweet and lively as praise, and rough, prickly, sour, astringent and mouldy as criticism. See what does pu-erh taste like.

Step 5: the spent leaf#

After the session, spread the leaves on a white plate.

• Whole, supple leaves mean careful picking and processing.
• Even colour means even processing.
• Broken bits and many stems mean lower grade.
• Hard, dark or burnt edges can mean over-roasting.

One more detail: on a real tea leaf, the side veins curve up and join before reaching the edge, and the edge is clearly serrated. It's a simple way to check that you're looking at tea at all.

Two stress tests#

1. The long steep. Brew a small amount for several minutes. Good tea may get strong, but it stays clean; poor tea turns harsh, sour or dusty.
2. Different temperatures. Brew once cooler and once hotter. Good tea is pleasant across a range; poor tea falls apart quickly.

And count the steeps: good whole-leaf tea lasts; see how many times can you steep tea.

Compare, don't judge alone#

The fairest way to judge a tea is next to another one: identical gaiwans, same leaf weight, same water and timings, ideally blind. One tea alone can fool you; two side by side rarely do. See how to taste tea.

Don't blame the tea too soon#

Before judging, rule out brewing: wrong temperature, too little or too much leaf, poor water. A great roasted oolong brewed at 80 °C will taste sour and thin. See why tea tastes sour, flat or weak.

My side-by-side: two Tieguanyins#

The lesson my friend taught me, repeated years later with two samples.

The label told me nothing. The leaves told me everything.

Red flags when buying#

• No origin, year or producer on the label.
• Grand age or "ancient tree" claims with no details.
• Heavy perfume in a tea that shouldn't be scented.
• Lots of dust in the bag.
• A brand-new wrapper on an "old" tea.

My honest take#

Trust your nose, your tongue and the spent leaf more than labels and stories. Do the white-plate test after every new tea for a month, and you'll never look at tea the same way.

The bottom line#

Judge tea in five steps: dry leaf, aroma, liquor, taste and spent leaf. Look for whole, clean leaf; clean, specific aroma; clear liquor; a sweet, lasting taste; and whole, supple spent leaves. Use a long steep and side-by-side comparisons to confirm. Start with my beginner's guide.

Read next: Loose Leaf Tea vs Tea Bags.