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Nature and farming · Soil and fields

An introduction to medicinal and aromatic plants: thyme, lavender and sage

Touch thyme and its scent clings to your fingers. Where was it hiding? Learn what an essential oil is, how glandular hairs store it, what thymol and linalool are, how steam distillation works and why "natural means harmless" is a myth, along with the safety rules.

  • 18 min
  • 2 simulations
  • Mini quiz

Updated:

Preview

The question

You are walking on a hillside in the Aegean or Mediterranean region of Türkiye when a small shrub crushed underfoot suddenly fills the air with the smell of thyme. Where was that smell hiding before you touched the plant? Why does a plant make such a strong smell at all? And why does a whole field of lavender yield only a few canisters of oil?

Try it yourself

No account needed: change the values and check your answer. Some simulations ask for a prediction before they start; it doesn't matter whether it's right or wrong.

Plant growth

Thyme on a Mediterranean hillside

Move the Light, Water and Temperature sliders and watch each factor's score and the limiting factor. Try every step on the Water slider. When growth reaches its highest, press Check.

Prediction

Predict first

Which mistake do you think most often kills thyme in a pot on a balcony?

It doesn’t matter whether you’re right; the simulation opens once you choose.

Ordering

The steps of steam distillation

Order the cards by dragging them or moving them with the keyboard, then press Check.

Prediction

Predict first

At the end of distillation, where do you think the lavender oil collects in the separator?

It doesn’t matter whether you’re right; the simulation opens once you choose.

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Embed the simulation on your site

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Frequently asked

5 questions

Is everything natural harmless?

No. Hemlock and foxglove are natural too, and they can kill. Harm depends not on where a substance comes from but on what it is and how much of it there is. Because essential oils are far more concentrated than the plant, compounds that are harmless in the plant can reach dangerous levels in the oil.

Can I put thyme oil in water and drink it?

No. Essential oils are not swallowed, and they are not dripped into water, tea or food. Even small amounts can cause serious poisoning, especially in children. If some is swallowed by accident, call the National Poison Information Centre (114 in Türkiye) or your local poison centre. If you have a health problem, ask a doctor or pharmacist.

Is an essential oil an oil like olive oil?

No. Despite the word "oil", it has no chemical kinship with plant oils such as olive oil; they only share the fact that they do not mix with water. An essential oil evaporates easily at room temperature and leaves no lasting stain on paper.

Why do two packets of kekik I bought smell different?

In Türkiye the name "kekik" is given not to one plant but to several genera, such as Thymus, Origanum, Thymbra and Satureja. Even plants of the same species on different hillsides can make oils dominated by different compounds (chemotypes). Harvest time, climate and drying also change the scent.

If a compound kills germs in the lab, can the plant be used as medicine?

No, you cannot draw that conclusion. An experiment in a lab dish does not show that the oil or tea does the same job safely in the body. This lesson gives no treatment or dosage advice for any illness; if you have a health problem, see a doctor or pharmacist.