Green tea and black tea come from the exact same plant. The only real difference is what happens to the leaves after they're picked: black tea leaves are left to react with air and turn dark, and green tea leaves are heated quickly to stop that from happening.
That single step is why one is light and grassy and the other is dark and malty.
The plant is the same
Both come from Camellia sinensis, a shrub grown across Asia and Africa. So do white tea, oolong, and pu-erh. There is no "black tea plant."
What separates them is processing — and mostly one part of processing, called oxidation.
What oxidation actually is
It's the same thing that happens to a cut apple left on the counter. Break the surface, expose it to air, and it browns.
Tea leaves do this too. After picking, they're bruised or rolled to break them open, then left in warm air. Natural enzymes go to work, and the leaf darkens and changes flavor as it goes.
- Green tea: heated within hours of picking — steamed or pan-fired — which shuts the enzymes down before browning starts. The leaf stays green and tastes closer to the fresh plant.
- Black tea: left to oxidize fully, for hours, until the leaf is dark brown or black. Then dried to stop it.
Everything else follows from that.
How they actually differ
| Green tea | Black tea | |
|---|---|---|
| Color in the cup | pale yellow-green | amber to deep red-brown |
| Taste | grassy, fresh, sometimes sweet or marine | malty, brisk, sometimes fruity |
| Water temperature | 175–185°F — not boiling | 205–212°F — full boil |
| Steeping time | 1–3 minutes | 3–5 minutes |
| Caffeine | slightly less | slightly more |
| Milk? | no | often |
The temperature difference is the one to remember. Boiling water on green tea leaves produces a bitter, harsh cup, and it's the single most common mistake people make when they switch from black tea to green.
What about caffeine?
Black tea generally has a bit more, but the gap is smaller than most people assume — and how you brew matters more than which type you pick.
One 2025 analysis found black tea at the top of the range across tea types, but also found that steeping the same tea for ten minutes instead of a few raised caffeine several times over, and that tea bags extracted more caffeine than loose leaf of the same tea.1 So a long-steeped green tea can easily out-caffeinate a quick black one.
Both have substantially less caffeine than coffee.
Which should you drink?
Whichever you like. But as a starting point:
- Try black tea first if you're coming from coffee, take milk in hot drinks, or want something in the morning that's hard to get wrong. It's forgiving and requires no temperature care.
- Try green tea first if you want something lighter, drink tea in the afternoon, or are curious about the fresher, more delicate end. Just get the water temperature right.
Both are unoxidized and fully oxidized versions of one leaf, so drinking both is the fastest way to understand what oxidation does — and everything else in tea, including oolong and white, sits somewhere on the line between them.
If you've only had it from bags
Try loose leaf of each once. The tea in most bags is ground fine, which makes it brew fast and go bitter fast. Whole leaves are more forgiving, and the difference is largest with green tea, where the delicate flavors are the first thing lost.
Our green tea and black tea steep timers use the ranges above by default, so you don't have to remember the temperature split while you're still learning it.