What is conventionally in the category
Peppermint, ginger, fennel, liquorice root and dandelion are the plants most often grouped this way in the European and North American trade. The category is broad and its edges are vague — cinnamon, cardamom and chamomile all appear in it depending on who is compiling the list.
A grouping that recurs across cultures
What distinguishes this category from most is how widely it recurs. Fennel seeds are taken after meals in India, mint infusions after meals across North Africa and the Middle East, and ginger preparations in China and across South-East Asia. Cultures with no contact developed comparable customs around comparable plants. That convergence is genuinely notable as a fact about human practice; it is not, on its own, an argument about mechanism, and it is regularly presented as though it were.
How they are prepared
This category splits by plant part, and the split matters. Leaves — peppermint, spearmint — are infused: boiling water, five minutes, covered, because the aromatic compounds that define them are volatile. Roots, barks and seeds — ginger, liquorice, fennel, dandelion root — need a decoction: simmered for ten to twenty minutes, because water has to work harder to extract from dense material. Applying a leaf steep to a root gives a thin and disappointing result, and it is the commonest preparation error in the category.
The limitation, stated plainly
The name records what these plants are traditionally taken for and where they sit in a shop. It is not a claim about what they do, and TeaHQ has not yet retrieved or assessed the evidence either way. One point of substance does belong here: liquorice root is the most safety-significant botanical TeaHQ expects to catalogue, and its record will carry a full sourced safety block before it publishes. Category membership tells a reader nothing about that, which is precisely why the safety information belongs on the plant and not on the category.