Thale Cress

Parts Usually Used

The leaves and aerial parts of the plant

Description of Plant(s) and Culture

Thale cress is a small annual (rarely biennial) plant from the mustard family (Brassicaceae), usually growing to 20-25 cm tall. 5-5 cm long, and 2-10 mm broad. The stem leaves are smaller and unstalked. Leaves are covered with small, unicellular hairs called trichomes. The flowers are small, 3 mm in diameter, arranged in clusters, with the typical four-petaled structure of the Brassicaceae family.

The fruit is a silique 5-20 mm long, containing 20-30 seeds. The plant has a relatively short lifecycle and can complete its entire development in six weeks.

Where Found

Thale cress is native to Europe, Asia, and Africa, with a geographic distribution from the Mediterranean to Scandinavia and Spain to Greece. It also appears in tropical alpine ecosystems in Africa. The plant has been introduced and naturalized worldwide, including in North America around the 17th century. It is commonly found along road shoulders, in disturbed land, agricultural fields, roadsides, railway lines, waste ground, and other disturbed habitats.

It readily grows and often pioneers rocky, sandy, and calcareous soils.

Medicinal Properties

Recent scientific research has revealed that thale cress possesses significant anti-cancer properties, particularly against breast cancer cells. When treated with the plant hormone jasmonate, the leaves demonstrate the remarkable ability to stop the growth of breast cancer cells while leaving normal cells unaffected. This selective action represents a potential breakthrough in cancer chemotherapy treatment, as it could lead to quicker recovery times and fewer side effects for patients.

The plant also has traditional medicinal uses as a mouthwash for treating sores in the mouth, though its medicinal applications have been historically limited compared to other plants in the Brassicaceae family.

Biochemical Information

The plant’s genome encodes approximately 27,600 protein-coding genes and about 6,500 non-coding genes. When treated with jasmonate (a plant hormone originally discovered in jasmine), thale cress produces bioactive compounds that demonstrate selective cytotoxic effects against cancer cells. The exact biochemical mechanisms are still being researched, but the compounds appear to target specific molecular pathways in breast cancer cells without affecting normal cellular function.

Legends, Myths and Stories

Thale cress has been described as the “Cinderella” of the medicinal plant world – a plant that was previously dismissed as having no significant medicinal value but has now shown remarkable therapeutic potential through modern scientific research. The plant was first described in 1577 in the Harz Mountains by Johannes Thal, a physician from Germany, who called it Pilosella siliquosa.

Carl Linnaeus later renamed it Arabis thaliana in honor of Thal, and in 1842, it was placed in the genus Arabidopsis by German botanist Gustav Heynhold.

Uses

In traditional practices, thale cress was occasionally prepared as a mouthwash intended for oral sores. The plant was also gathered as an edible green, eaten either raw in salads or cooked, though it was not widely utilized as a food source. In modern science, researchers came to rely on it as a primary model organism for investigating plant genetics, developmental biology, DNA repair mechanisms, circadian rhythms, and cellular processes.

How Sold

Thale cress is not commonly available as a commercial medicinal product. It is primarily available through: Research institutions and seed suppliers for scientific purposes Specialty botanical suppliers Wild harvesting (where legally permitted)