Sonchus oleraceus (Asteraceae) Common Sowthistle

Dec 4, 2025
12 min read

Updated: Jun 24

Sonchus oleraceus, commonly known as sow thistle or common sowthistle, is a nutritious wild edible and potent medicinal plant native to Europe and Western Asia, now cosmopolitan in distribution. It is highly valued for its remarkable anti-inflammatory, analgesic, and gastroprotective properties. Modern research has validated its traditional uses, identifying a wealth of bioactive compounds including sesquiterpene lactones, flavonoids, and phenolic acids, while also revealing significant enzyme-inhibiting and cellular-protective activities .

1. Taxonomic Insights

Species: Sonchus oleraceus L.

Family: Asteraceae (Compositae)

The Asteraceae family, commonly known as the aster, daisy, or sunflower family, is one of the largest families of flowering plants. It is characterized by composite flower heads (capitula) composed of many small florets, surrounded by involucral bracts. This family is medicinally significant for its diverse array of sesquiterpene lactones, flavonoids, and phenolic compounds .

Taxonomic Note: The species was first described by Carl Linnaeus in 1753. The genus name Sonchus is derived from the Greek word sonchos, meaning hollow, referring to its hollow stems. The specific epithet oleraceus means "vegetable/herbal" or "used in cooking," reflecting its long history as a food plant. The plant is an annual, occasionally biennial, reproducing by seed. It is easily recognized by its pinnatifid leaves with spiky margins and pointed auricles clasping the stem, and its clusters of pale yellow, dandelion-like flower heads .

Related Herbs from the Same Family:

· Lapsana communis (Nipplewort): A close relative sharing similar mild diuretic and anti-inflammatory properties, and traditional use for soothing skin irritations.

· Taraxacum officinale (Dandelion): Another Cichorieae member, renowned for its diuretic, hepatoprotective, and digestive properties. Both plants contain sesquiterpene lactones and phenolic acids .

· Cichorium intybus (Chicory): A close relative in the Cichorieae tribe, with similar diuretic and digestive properties, and roasted roots used as a coffee substitute.

· Lactuca sativa (Lettuce): A cultivated species in the same tribe, known for its mild sedative and analgesic properties due to its lactucarium content .

---

2. Common Names

Scientific Name: Sonchus oleraceus |

English: Common Sowthistle, Smooth

Sowthistle, Milk Thistle (note: different from

Spanish: Cerraja, Lechuguilla | French: Laiteron maraîcher | German: Gewöhnliche Gänsedistel | Chinese: Kŭcài |Italian: Grespino comune, Cicerbita

---

3. Medicinal Uses

Primary Actions: Anti-inflammatory, Analgesic, Antioxidant, Diuretic, Laxative, Gastroprotective

Secondary Actions: Anxiolytic, Antidepressant, Antinociceptive, Hepatoprotective, Nephroprotective, Anti-aging, Antimicrobial (weak), Antispasmodic

Medicinal Parts:

The aerial parts (leaves, stems, flowers) and the root are used medicinally .

· Leaves: The primary part used for topical applications, as a mild diuretic tea, and as a cooked green. Rich in phenolic acids, flavonoids, and vitamins. The milky latex is said to be soothing to sensitive skin.

· Aerial Parts: Used in traditional medicine for their anti-inflammatory, analgesic, diuretic, and tonic properties. Modern research confirms significant antioxidant and gastroprotective activities.

· Roots: Used in decoctions for gastrointestinal issues, as a tonic, and for fever. The root extract has shown remarkable anti-ulcer activity .

· Latex: The milky sap is traditionally used topically for its soothing and wound-healing properties, similar to that of other Cichorieae plants .

---

4. Phytochemicals Specific to the Plant and Their Action

The phytochemistry of S. oleraceus is characterized by a diverse profile of sesquiterpene lactones, flavonoids, phenolic acids, and sterols.

· Sesquiterpene Lactones (Eudesmanolides and Guaianolides): These are signature compounds in the Asteraceae family. Eudesmanolide 4 and 47, germacranolides 77, 81, 83, and 88, costus lactone type guaianolides 138 and 155, and lactucin derivative 292 have been identified . These compounds contribute to the anti-inflammatory and gastroprotective activities.

· Volatile Oil (n-Nonadecane, trans-Caryophyllene, trans-Methyl dihydrojasmonate): The essential oil of S. oleraceus is characterized by a high content of sesquiterpenes (42.19%) and nonterpenoidial hydrocarbons (28.77%). The main components are n-nonadecane (28.77%), trans-caryophyllene (23.73%), trans-methyl dihydrojasmonate (19.55%), and cis-cadina-1,4-diene (9.44%) . trans-Caryophyllene is well-known for its potent anti-inflammatory properties.

· Phenolic Compounds (Quinic acid, Pyrogallol, Gentisic acid, Caffeic acid): Aqueous extracts contain significant amounts of phenolic acids. Quinic acid, pyrogallol, gentisic acid, and caffeic acid are among the most abundant in LC/MS/MS spectra . These contribute to the antioxidant, anti-inflammatory, and hepatoprotective activities.

· Flavonoids (Apigenin, Luteolin, Fisetin, and their glycosides): Flavonoids such as apigenin-7-glucuronide, luteolin-7-glucoside, luteolin-7-glucosylglucuronide, and luteolin-7-glucuronide have been identified . These contribute to antioxidant, anti-inflammatory, and diuretic effects.

· Other Metabolites: The plant contains sterols (β-sitosterol-3-O-glucopyranoside), triterpenes (taraxasterol), coumarins (scopoletin), vitamins (ascorbic acid, vitamin C), and carotenoids (β-carotene) . A total of 68 compounds have been tentatively identified in aqueous extracts .

---

5. Traditional and Ethnobotanical Uses Covering the Medicinal Uses

Shotha (Inflammation) & Vedana (Pain)

Formulation: Aerial parts as a decoction or extract.

Preparation & Use: In Brazilian folk medicine, the plant has been used to relieve pain . Research has shown that hydroethanolic and dichloromethane extracts of the aerial parts produced significant antinociceptive action in mice, supporting its traditional analgesic use .

Reasoning: The anti-inflammatory and analgesic effects are attributed to the presence of flavonoids, phenolic acids, and sesquiterpene lactones. The volatile oil component trans-caryophyllene is also a well-known anti-inflammatory agent. Studies confirm significant inhibition of ear edema (anti-inflammatory) in mice .

Kshata (Sores, Ulcers, and Gastrointestinal Disorders)

Formulation: Root decoction, aerial parts extract.

Preparation & Use: The plant has been used in folklore medicine for the treatment of gastrointestinal tract disorders . A root decoction has shown promising anti-ulcer activity, with the total alcohol extract of the root (500 mg/kg) producing 88.5% protection from control ulcer, which is significantly more effective than the standard drug omeprazole . The aerial parts extract showed strong anti-ulcerative colitis activity (77.28% protection) .

Reasoning: The gastroprotective effects are likely due to the combination of flavonoids, tannins, and unsaturated sterols. The phenolic contents of the butanol fractions might be responsible for the antiulcerogenic activity . The plant extracts are characterized by a low degree of toxicity and are considered safe .

Mutrakrichra (Urinary Disorders) & Diuretic

Formulation: Whole plant infusion.

Preparation & Use: All parts of the plant are used as a coolant, diuretic, and mild laxative. An infusion is made of the entire plant and taken as a drink . In Baluchistan (Pakistan), the roots and leaves are used as a tonic and febrifuge .

Reasoning: The diuretic effect is attributed to the presence of flavonoids (apigenin, luteolin) and phenolic acids (caffeic acid, chlorogenic acid). These compounds have documented diuretic activity, promoting increased urine output.

Chinta (Anxiety) & Depression

Formulation: Plant extract.

Preparation & Use: Studies indicate that S. oleraceus extract exerts an anxiolytic-like effect on mice . It has also demonstrated moderate antidepressant activity , suggesting potential interest for the treatment of depressive disorders.

Reasoning: The anxiolytic and antidepressant effects may be due to the modulation of neurotransmitter systems by various bioactive compounds, though the exact mechanism requires further investigation.

Jwara (Fever) & Mild Laxative

Formulation: Aerial parts as a tea, whole plant infusion.

Preparation & Use: The plant has been used as a mild tonic, febrifuge, and for general digestive complaints . The brownish gum left after the evaporation of the juice is considered a powerful hydragogue and cathartic . In China, it is used as a diuretic and mild laxative .

Reasoning: The mild laxative and tonic effects are likely due to the combination of flavonoids, phenolic acids, and the high fiber content.

---

6. Healing Recipes, Decoctions, and Preparations

Anti-inflammatory and Analgesic Aerial Parts Decoction

Purpose: To reduce inflammation and relieve pain.

Preparation & Use:

1. Measure 2-3 grams (about 1 to 2 teaspoons) of dried aerial parts.

2. Place in a cup and pour 250 ml of just-boiled water over the herb.

3. Cover and steep for 5-10 minutes, then strain.

4. The resulting tea is taken warm, up to two cups per day.

Gastroprotective Root Decoction

Purpose: For ulcers and gastrointestinal issues.

Preparation & Use:

1. Boil 10 grams of dried root in 500 ml of water for ten minutes.

2. Strain and drink 200 ml once daily.

3. Safety Note: Do not exceed the recommended dose. Use under professional guidance .

Topical Poultice for Wounds and Skin Irritation

Purpose: For minor cuts, bruises, and skin irritation.

Preparation & Use:

1. Take a handful of fresh Sonchus oleraceus leaves.

2. Crush or blend into a pulp.

3. Apply directly to the affected area, cover with a clean cloth, and leave for 30-60 minutes.

4. Rinse with warm water. Use twice daily as needed.

---

Culinary Uses of Sonchus oleraceus (Sow Thistle)

Unlike many of its bitter cousins in the Asteraceae family, Sonchus oleraceus has a long history of use as a nutritious wild edible, valued for its tender texture and subtle taste .

1. Salad Uses (Young Leaves)

The most popular way to enjoy sow thistle is raw in salads.

Preparation: The youngest, most tender leaves, particularly those from the centre of the rosette before the plant bolts, are the best choice. They have a mild, slightly nutty flavour with little to no bitterness. To prepare, wash the leaves thoroughly and pat them dry. They can be torn or chopped into bite-sized pieces.

Flavour Profile: Mild, nutty, and slightly sweet, reminiscent of a cross between lamb's lettuce (corn salad) and a mild spinach. The flavour is delicate and pairs well with a wide range of dressings, from a simple vinaigrette to a creamy yogurt dressing.

2. Soups

Sow thistle can be used as a nutritious and flavourful pot herb in soups, similar to how you might use spinach or nettles.

Preparation: The leaves, including the more mature ones, can be used in soups. They wilt down considerably, so you will need a good handful. Wash the leaves, chop them roughly, and add them to the soup during the last 5-10 minutes of cooking to preserve their colour and nutrients.

Flavour Profile: Sow thistle adds a mild, earthy note and a pleasant green flavour to soups without overwhelming other ingredients. It also thickens the soup slightly due to its mild mucilaginous properties.

3. Side Dishes and Cooked Greens

Sow thistle can be cooked as a side dish in the same way you would prepare spinach, Swiss chard, or kale.

Preparation: The leaves can be steamed, sautéed, or lightly boiled. They wilt down significantly, so collect a generous amount. For older, slightly tougher leaves, a brief blanching in boiling water (1-2 minutes) can help soften them and reduce any residual bitterness. They can then be drained and finished in a pan with butter or olive oil.

Flavour Profile: When cooked, the leaves become tender and take on a mild, earthy, spinach-like flavour. They are very versatile and pair well with garlic, lemon, and butter.

Foraging and Preparation Notes

Harvesting: Always pick young, tender leaves from the centre of the rosette. Avoid older, tougher, or yellowing leaves. Harvest from clean, unpolluted areas away from roadsides and agricultural land.

Bitterness: While sow thistle is generally mild, leaves growing in dry, sunny conditions or those that are older may develop a slight bitterness. A brief blanching in boiling water can help remove this .

---

7. In-Depth Phytochemical Profile and Clinical Significance of Sonchus oleraceus (Sow Thistle)

Introduction

Sonchus oleraceus, the humble sow thistle, is a plant that has quietly served European, Asian, and African folk medicine for centuries, only to gain significant scientific interest in recent decades. Its common name reflects its weedy nature and historical use as animal fodder, but it is also a highly nutritious food and a potent medicinal plant. Modern research has reawakened scientific interest, revealing a plant of surprising chemical sophistication and remarkable therapeutic potential. Its therapeutic identity is shaped by a unique arsenal of sesquiterpene lactones, a volatile oil rich in anti-inflammatory compounds, and a wealth of phenolic antioxidants. The discovery that its extracts demonstrate significant enzyme-inhibiting and cellular-protective activities provides a mechanistic basis for its traditional use in inflammation, pain, and gastrointestinal disorders. S. oleraceus stands as a testament to the potential of rediscovering "forgotten" medicinal plants .

1. Sesquiterpene Lactones: The Anti-inflammatory and Gastroprotective Arm

Key Compounds: Eudesmanolide 4 and 47, germacranolides 77, 81, 83, and 88, costus lactone type guaianolides 138 and 155, and lactucin derivative 292 .

Pharmacological Profile: These compounds are characteristic of the Asteraceae family and are known for their potent anti-inflammatory and gastroprotective effects. In S. oleraceus, they are considered key contributors to the plant's medicinal properties, particularly for gastrointestinal disorders .

2. Volatile Oil: The Anti-inflammatory and Antioxidant Arm

Key Compounds: n-Nonadecane (28.77%), trans-Caryophyllene (23.73%), trans-Methyl dihydrojasmonate (19.55%), cis-Cadina-1,4-diene (9.44%) .

Quantitative Profile: The essential oil of S. oleraceus is characterized by a high content of sesquiterpenes (42.19%) and nonterpenoidial hydrocarbons (28.77%) .

Actions and Clinical Relevance:

· Anti-inflammatory: trans-Caryophyllene is a well-known anti-inflammatory sesquiterpene. Its presence in the volatile oil contributes significantly to the plant's anti-inflammatory profile .

· Antioxidant: The essential oil demonstrated antioxidant capacities on DPPH and ABTS assays, with IC50 values of 609.35 and 804.16 µg/mL, respectively .

· Cytotoxic: The oil showed remarkable inhibitory effects on the proliferation of HepG2 cancer cell lines, with an IC50 of 136.02 µg/mL .

3. Phenolic Compounds and Flavonoids: The Antioxidant and Protective Arm

Key Compounds: Quinic acid, Pyrogallol, Gentisic acid, Caffeic acid, Apigenin, Luteolin, Fisetin .

Actions and Clinical Relevance:

· Antioxidant: Aqueous extracts of aerial parts and roots contain significant amounts of polyphenols, flavonoids, and tannins. The aerial parts extract showed strong DPPH, ABTS, hydroxyl radical scavenging, and CUPRAC activities . A total of 68 compounds were tentatively identified, many of which were found for the first time in Tunisian Sonchus oleraceus .

· Enzyme Inhibition (Elastase and Hyaluronidase): The phenolic compounds are likely responsible for the inhibition of elastase and hyaluronidase, enzymes involved in the breakdown of extracellular matrix components during inflammation and tissue damage.

· Hepatoprotective and Nephroprotective: Studies have shown that S. oleraceus extract protects against diabetes-related liver injury in rats through the TLR4-NF-κB signaling pathway and exhibits nephroprotective effects against kidney injury induced by ischemia-reperfusion in Wistar rats .

4. Anti-aging and Cellular Protection

Key Compounds: Methanolic extract components.

Actions and Clinical Relevance:

· Anti-aging: The methanolic extract of Sonchus oleraceus showed greater cellular antioxidant activity than chlorogenic acid in WI-38 cells. The extract inhibited H2O2 stress-induced early senescence in a dose-dependent manner, suggesting its potential to be formulated as an anti-aging agent .

5. Gastroprotective Activity

Key Compounds: Flavonoids, tannins, unsaturated sterols.

Actions and Clinical Relevance:

· Anti-ulcer: The root extract showed promising antiulcerogenic activity, with the total alcohol extract (500 mg/kg) producing 88.5% protection from control ulcer, which is significantly more effective than the standard drug omeprazole (20 mg/kg) .

· Anti-ulcerative colitis: The total extract of the aerial parts (500 mg/kg) showed strong anti-ulcerative colitis activity, producing 77.28% protection from control colitis .

An Integrated View of Healing in Sonchus oleraceus

· For Inflammation, Pain, and Tissue Protection: S. oleraceus is a classic example of a plant whose traditional use is now supported by modern pharmacology. The anti-inflammatory and analgesic effects are mediated by the limonene in the essential oil, the sesquiterpene lactones, and the enzyme-inhibiting phenolic compounds. The low toxicity profile further reinforces its suitability as a safe, effective remedy .

· For Gastrointestinal Health: The traditional use of the plant for gastrointestinal disorders is strongly supported by scientific evidence. The root extract is particularly effective for ulcers, while the aerial parts are effective for ulcerative colitis .

· As an Edible and Nutritive Plant: The plant is edible, with young leaves used in salads, cooked as a potherb, or used in soups. It is a good source of vitamins, pro-vitamins, and carotenoids with health-promoting and antioxidant properties .

Toxicological Profile and Quality Control

Safety Profile: S. oleraceus is generally recognized as safe for food and medicinal use based on its historical use. Acute toxicity studies indicate that the oral LD50 is greater than 5 g/kg in mice, and no mortality was recorded . Sub-chronic toxicity studies (500 mg/kg for 14 days) did not alter liver and kidney functions, indicating that the extracts are neither hepatotoxic nor nephrotoxic . However, due to its mild laxative effect, excessive intake can cause mild gastrointestinal irritation. Pregnant or nursing women should consult a qualified healthcare professional before use.

Quality Control Parameters: The identification of trans-caryophyllene as a major volatile component provides some parameters for standardization of volatile fractions. The standardization of extracts based on phenolic and flavonoid content is a key area for quality control for antioxidant and anti-inflammatory applications .

Conclusion: Sonchus oleraceus is a compelling example of a "forgotten" medicinal plant undergoing a scientific rediscovery. From a humble weed used as a food and a mild diuretic, it has emerged as a plant with a remarkable phytochemical profile and significant therapeutic potential. The discovery of its gastroprotective, anti-inflammatory, antioxidant, and analgesic activities provides a solid mechanistic basis for its traditional uses. S. oleraceus stands as a promising candidate for further research, particularly in gastroenterology and inflammatory conditions, representing a potent link between folk tradition and modern pharmacology.

---

Disclaimer:

Sonchus oleraceus is generally considered safe for moderate use, but comprehensive safety data, particularly for concentrated extracts and long-term use, are still emerging. Pregnant or nursing women should consult a qualified healthcare professional before use. Excessive intake can cause mild gastrointestinal irritation. Always consult a qualified healthcare professional before using this plant for medicinal purposes. This information is for educational use only and is not a substitute for professional medical advice.

---

8. Reference Books, Books for In-depth Study

· A Modern Herbal by Maud Grieve (1931) - for traditional uses

· Phytochemistry journal (various volumes) - for sesquiterpene lactone research

· Journal of Ethnopharmacology (2009, Vol. 124) - for antinociceptive activity research

· Saudi Pharmaceutical Journal (2018, Vol. 26) - for anti-ulcer and anti-ulcerative colitis research

· Plants journal (2024, Vol. 13) - for essential oil composition and bioactivities

· Flora of North America (Vol. 19) - for botanical description and distribution

---

9. Further Study: Plants That Might Interest You Due to Similar Medicinal Properties

1. Lapsana communis (Nipplewort)

· Species: Lapsana communis | Family: Asteraceae

· Similarities: A close relative in the Cichorieae tribe, sharing similar mild diuretic, anti-inflammatory, and wound-healing properties. Nipplewort is more traditionally used for soothing skin irritations .

2. Taraxacum officinale (Dandelion)

· Species: Taraxacum officinale | Family: Asteraceae

· Similarities: Another Cichorieae member with a long history of use as a diuretic, hepatoprotective, and digestive tonic. Dandelion is more widely researched for its liver-supporting benefits .

3. Cichorium intybus (Chicory)

· Species: Cichorium intybus | Family: Asteraceae

· Similarities: A close relative in the Cichorieae tribe with similar diuretic, digestive, and mild laxative properties. Chicory root is well-known as a coffee substitute and prebiotic.

4. Lactuca virosa (Wild Lettuce)

· Species: Lactuca virosa | Family: Asteraceae

· Similarities: Another member of the Cichorieae tribe, known for its milky sap (lactucarium) which has mild sedative, analgesic, and antispasmodic properties. It shares the emollient and soothing qualities of S. oleraceus's latex.

PREHEALING

Sonchus oleraceus (Asteraceae) Common Sowthistle

Related Posts

Comments