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Drying directly on the ground should be avoided!
If there is a concrete or cement floor, the medicinal plant material should be laid out on a clean tarpaulin, sheet or other clean piece of cloth.

it is very important to harvest on a dry, sunny day and avoid harvesting in the rainy season.
The first days of drying in dry, sunny weather will ensure the green colour and strong odour of the Artemisia.

Unlike most medicinal plants, drying in direct sunlight does not affect the therapeutic properties of Artemisia.

Table sechage

Avoid cutting plants directly into segments if the weather is wet, as mould will develop very quickly!
This method of drying directly in segments requires a 24-hour rain free period before harvesting and dry and sunny weather.

Drying is optimal when branches break cleanly when bent at a right angle! Plant material should be turned sufficiently so that it does not overheat. The temperature should ideally remain below 40°C, and definitely below 60°C to preserve volatile compounds and essential oils of the plants. [9]
Phytosterols, saponins and fatty acids are not greatly affected by high drying temperatures. Only temperatures above 80°C show significant decreases. [10]


1.  World Health Organisation. WHO guidelines on good agricultural and collection practices (GACP) for médicinal plants. 2003. Available at: https://www.who.int/medicines/publications/traditional/gacp2004/en/

2. Ferreira JF, Luthria DL. Drying affects artemisinin, dihydroartemisinic acid, artemisinic acid, and the antioxidant capacity of Artemisia annua L. leaves. Agric Food Chem. 2010 Feb 10;58(3):1691-8. doi: 10.1021/jf903222j.

3. J.C. Laughlin. Post-harvest Drying Treatment Effects on Amtimalarial Constituents of Artemiasia annua L.. ISHS Acta Horticulturae 576: International Conference on Medicinal and Aromatic Plants. Available at: https://wwwlib.teiep.gr/images/stories/acta/Acta%20576/576_47.pdf

4. XG Zheng, J Jin, YR Liang, Effect of ultraviolet-B irradiation on accumulation of catechins in Camellia sinensis. Afr J Biotechnol. 2008, 18, no 7

5. E Goto. K Hayashi, Effect of UV light on phytochemical accumulation of anthocyanin biosynthesis genes in red leaf lettuce. ISHS, doi 10.17660/Acta Hortic.2016.1134.24.

6. A Arakawa, Effect of UV light on anthocyanin synthesis in sweet cherry. J Japan Hort Sci, 1993, 62-3 543-546.

7. M Sun, X Gu J Tian, Change of secondary metabolites in leaves of Ginkgo biloba in response to UV-B irradiation. Innov Food Sci and Emerging Technologies 2010 11, 672-676

8. Hashim K. Mohammed Al-oubaidi*, Baan Munim Abdulrazzaq Twaij*, Aseel Salih Mohammed-Amee. Effect of (UV) light on production of medicinal compounds of            Althaea officinalis L. in vitro.  World Journal of Pharmaceutical Sciences ISSN (Print): 2321-3310; ISSN (Online): 2321-3086

9. M B Hassanpouraghdam , A Hassani ,. Drying Method Affects Essential Oil Content and Composition of Basil (Ocimum basilicum). J Essential Oil Bearing Plants, 2010, 13, 759-766.

10. Hong Ngoc Thuy Pham, Van Tang Nguyen, t. Effect of Extraction Solvents and Drying Methods on the Physicochemical and Antioxidant Properties of Helicteres.