Tea vs Herbal Infusion: What's Actually 'Tea'

In everyday English, "tea" has become a verb's-worth of meanings: the drink, the meal, the leaf, and — loosest of all — practically anything botanical steeped in hot water. Ask for tea in one house and you will get strong Assam with milk; in another, a fragrant cup of chamomile. Both are wonderful drinks. But strictly speaking, only one of them is tea.

The strict definition: one plant

True tea is an infusion of the leaves and buds of a single species: Camellia sinensis, an evergreen shrub native to the borderlands of southwestern China and northeastern India. Every white, green, yellow, oolong, black and dark tea in the world — from a Japanese sencha to a Yunnan pu-erh cake — is made from this one plant, its varieties and cultivars. The families differ only in how the leaf is processed after picking, chiefly how far it is allowed to oxidise; we map them all in The Main Types of Tea, and trace the plant's remarkable journey around the world in The Global History of Tea.

Industry and trade bodies, including the UK Tea & Infusions Association, use the same botanical definition: if it is not Camellia sinensis, it is not tea. Which brings us to everything else in the "tea" aisle.

Everything else: herbal infusions, or tisanes

Drinks made by steeping any other plant — leaves, flowers, seeds, roots, bark or fruit — are properly called herbal infusions or tisanes (from the French, ultimately from the Greek ptisanē, a barley drink). The category is vast and ancient; almost every culture has its steeped remedies and comforts. Some of the most widely drunk include:

• Chamomile — the dried daisy-like flowers of Matricaria chamomilla, honeyed and apple-scented, a classic evening cup across Europe.
• Peppermint — the leaves of Mentha × piperita, cool and brisk, beloved from Morocco (usually blended with green tea there, making that famous drink a hybrid) to after-dinner tables everywhere.
• Rooibos — the needle-like leaves of Aspalathus linearis, a South African shrub of the legume family, giving a russet, gently sweet, naturally caffeine-free cup often called "red bush tea".
• Hibiscus — the tart crimson calyces of Hibiscus sabdariffa, drunk hot or iced as karkadé in Egypt and Sudan, agua de jamaica in Mexico and sorrel in the Caribbean.
• Tulsi (holy basil) — the aromatic leaves of Ocimum tenuiflorum, revered in India and steeped on its own or blended with spices.

None of these contains a single leaf of Camellia sinensis. Calling them "herbal tea" is harmless everyday shorthand — and we do not propose to police anyone's kitchen vocabulary — but on this site, and in this article, "tea" means the true leaf, and the rest are infusions. Regulators broadly agree: in several jurisdictions, labelling rules distinguish tea from herbal infusions for exactly this reason.

How the words got muddled

The confusion is really a compliment to tea's success. Steeped herbal drinks are far older in Europe than tea itself — infusions of chamomile, mint, linden and the like were household remedies for centuries before the first chests of Chinese leaf reached Amsterdam and London in the seventeenth century. But tea's conquest of daily life was so total that within a few generations the newcomer's name swallowed the whole category: any comforting plant steeped in hot water became a "tea". English is not alone in the muddle, but it is worth noticing that French keeps thé and tisane firmly apart, and German distinguishes Tee from Kräutertee on the label if not always in speech. The vocabulary drifted; the plants never did.

Why the distinction matters: caffeine

This is not mere pedantry, because the botanical line is also, for most practical purposes, the caffeine line. Camellia sinensis produces caffeine naturally in its leaves, so every true tea is caffeinated — green and white included, whatever café folklore says. A typical brewed cup carries somewhere in the tens of milligrams, varying with type, leaf amount and steeping; we unpack the numbers in Does Tea Contain Caffeine?.

Most herbal infusions, by contrast, are naturally caffeine-free. Chamomile, peppermint, rooibos, hibiscus and tulsi contain no caffeine at all, which is precisely why so many of them are reached for in the evening. If you want a warm, flavourful cup without caffeine, a tisane — not a green tea — is the reliable choice.

But the rule has famous exceptions, and they cut the other way. Yerba mate (Ilex paraguariensis), the beloved shared drink of Argentina, Uruguay, Paraguay and southern Brazil, and guayusa (Ilex guayusa), its Amazonian cousin from Ecuador, are both hollies, not tea plants — yet both naturally contain caffeine, in quantities broadly comparable to tea. They are, in other words, caffeinated infusions that are still not tea. Coffee's caffeine, tea's caffeine and mate's caffeine are the same molecule; the plants simply evolved it independently.

A quick field guide

When you meet an unfamiliar hot drink, three questions sort it in seconds. Is it made from Camellia sinensis? If yes, it is tea — file it under white, green, yellow, oolong, black or dark, per our types guide. Is it a blend? Earl Grey (black tea with bergamot), jasmine tea (green tea scented with blossoms), Moroccan mint (green tea with mint) and masala chai (black tea with spices and milk) are all flavoured true teas — the tea leaf is present, so the caffeine is too. Is there no tea leaf at all? Then it is a tisane: probably caffeine-free, unless it is built on mate, guayusa or another caffeinated plant.

Two practical footnotes complete the picture. Decaffeinated tea is still true tea — the leaf is Camellia sinensis, processed commercially to remove most (not quite all) of its caffeine — so it sits on the tea side of the line with an asterisk. And rooibos, despite the marketing phrase "red tea", is neither a tea nor related to one; it earns its place in the cupboard entirely on its own merits, which are considerable.

However you sort them, the pleasure is real on both sides of the line. A silvery white tea and a scarlet hibiscus infusion are simply different drinks with different stories — and knowing which is which means you will always know what is actually in your cup. If you land on the tea side tonight, our profiles of green tea and black tea are good places to begin, and our brewing guide will help you do the leaf justice.

Where to go next

Follow the leaf itself through history in The Global History of Tea, meet the five families in The Main Types of Tea, or get the numbers on caffeine in Does Tea Contain Caffeine?. Fancy something cold and true-tea-based? Try our iced green tea recipe.