Big Quaking Grass (Briza maxima L.): A Comprehensive Reference
1. Identity, Nomenclature, and Botanical Description
Scientific and Common Names
Briza maxima L. is a species of the grass genus Briza, native to Northern Africa, Western Asia, and Southern Europe, and cultivated or naturalised in the British Isles, the Azores, Australasia, the western United States, Central and South America, and Hawaii. This species has a large number of common names, including big quaking grass, great quaking grass, greater quaking-grass, large quaking grass, blowfly grass, rattlesnake grass, shelly grass, rattle grass, and shell grass.
Briza maxima was first described by Carl Linnaeus, the father of modern taxonomy, in his seminal work Species Plantarum in 1753. The genus name "Briza" is derived from the Greek word "bryzē," meaning "to nod" or "to shake," while the species epithet "maxima" is a Latin term denoting "greatest" or "largest," referring to the size of its inflorescence.
According to Plants of the World Online (Kew Science), the species carries several historical synonyms, including Briza grandis Salisb. (1796, illegitimate), Briza major C.Presl (1818, illegitimate), Macrobriza maxima (L.) Tzvelev (1993), and Poa maxima (L.) Cav. (1802). The plant is also sold as Briza major and may be confused with Briza minor, although Briza minor is smaller in size.
Taxonomy
- Family: Poaceae (grasses)
- Genus: Briza
- Species: Briza maxima L.
Morphology and Growth Habit
It is an annual grass growing to a height of 60 cm. It typically grows in clumps or tufts, reaching a height of about 30–60 centimetres (12–24 inches), with slender stems that emerge from the base and stand erect, supporting the inflorescence above. The leaves are linear in shape — long and narrow with parallel veins — with a bluish-green colouration, arising from the base of the plant, forming a dense and compact tuft.
The most defining feature is its pendulous seed heads, which can range from 3 to 5 centimetres long; when wind blows through, these seed heads "quake" gently, hence the common name. The flowering stalk usually has 3–8 large spikelets, which droop at the tip.
Natural Range and Distribution
The native range of this species is Macaronesia to the Mediterranean. It is an annual and grows primarily in the subtropical biome. Its native range encompasses Albania, Algeria, the Azores, the Balearic Islands, Bulgaria, the Canary Islands, Corsica, Cyprus, the East Aegean Islands, France, Greece, Italy, Crete, Lebanon-Syria, Libya, Madeira, Morocco, the northwestern Balkan Peninsula, Palestine, Portugal, Sardinia, Sicily, Spain, Tunisia, and Turkey. In California, it is classified as a winter annual grass (family Poaceae) and is located throughout the coastal ranges.
Common Forms and Preparations
According to the Kew Science Plants of the World Online database, Briza maxima has environmental uses, as a medicine, and for food. The seeds are crushed and cooked and used in porridge and bread; the young flowering spikes are eaten raw as a snack. In traditional herbal contexts, herbalists brewed its seeds and leaves into infusions or teas, believing that its calming properties could help ease nervous tension and promote restful sleep. The dried inflorescences are also widely used in floral arrangements: one of the most popular uses of Briza maxima is in dried arrangements, where its unique seed heads add texture and movement, and the dried stems and seed heads are used for creating wreaths and other natural crafts.
2. Traditional and Historical Use
Folk Medicine in Europe and the Mediterranean Region
Briza maxima, a member of the Poaceae family, has been traditionally utilised in folk medicine across various cultures, especially in the Mediterranean region. Historically, its seeds and extracts were used as a mild diuretic and to support digestive health. Ancient herbal texts reference the grass for its soothing properties and its application in poultices for minor skin irritations.
With its delicate, nodding seed heads, big quaking grass has been cherished in traditional herbal practices for centuries. Though not as widely recognised as some other botanicals, historical records from Europe and parts of Asia highlight its gentle contributions to folk medicine. Traditionally, big quaking grass was employed as a soothing agent for mild respiratory complaints, such as coughs and throat irritation. Herbalists brewed its seeds and leaves into infusions or teas, believing that its calming properties could help ease nervous tension and promote restful sleep.
A 2016 ethnobotanical survey published in the Journal of Ethnobiology and Ethnomedicine (Gras et al.) documented the folk uses of plants across territories of Catalonia and the Balearic Islands (Spain), and Briza maxima L. (Poaceae) appeared in its non-food, non-medicinal folk plant use tables — indicating documented human use of the plant in that region, although the specific uses recorded in that study were non-medicinal (e.g., craft or decorative applications). Additional ethnobotanical documentation of the plant's traditional use of seeds as food comes from González et al. (2011), covering the consumption of wild and semi-domesticated edible plants in the Arribes del Duero (Salamanca-Zamora, Spain), and from Redzic (2006), covering wild edible plants in Bosnia-Herzegovina.
Reliability of Traditional Claims
It should be noted that sources vary considerably in the weight they assign to Briza maxima's traditional medicinal role. While certain sources describe folk uses including respiratory, digestive, and mild sedative applications, peer-reviewed clinical studies directly assessing big quaking grass in humans remain limited. The ethnobotanical record is most consistent with non-medicinal and food uses (seeds and young flowering spikes), and the medicinal claims rest primarily on non-peer-reviewed folk tradition accounts.
3. Key Constituents and Active Compounds
Flavonoids
The most rigorously documented phytochemical research on the genus Briza involves leaf flavonoids. A phytochemical survey published in Phytochemistry (ScienceDirect) examined flavonoid variation across Eurasian and South American Briza species. During a survey of 6 Eurasian and 10 South American Briza species for leaf flavonoids, 27 components were found. Twelve of these were identified: tricin 5-glucoside, tricin 7-glucoside, quercetin 3-glucoside, kaempferol 3-glucoside, vitexin, isovitexin, orientin, iso-orientin, and the 4'-O-glucoside of all four glycoflavones. Notably, Briza maxima stands apart from the other Eurasian species in its flavonoid pattern; whereas the other Eurasian species accumulate mainly vitexin and isovitexin, Briza maxima exhibits a distinct flavonoid profile.
Preliminary broader phytochemical analyses have indicated that the plant contains bioactive compounds such as flavonoids and phenolic acids, which are known for their antioxidant activity.
Antimicrobial Protein: Bm-AMP1
The most well-characterised unique compound isolated from Briza maxima at the molecular level is a seed-derived antimicrobial protein. Researchers purified a new antimicrobial protein from seeds of Briza maxima, called Bm-AMP1 (Briza maxima antimicrobial protein 1). The protein shares the common cysteine/glycine domain of the Chitin-binding Plant Proteins, but is unique as it possesses very potent and broad-spectrum antifungal activity. Despite the conserved nature of these protein sequences, the Briza protein is markedly improved in the potency and spectrum of its antifungal activity.
The amino acid sequence for Bm-AMP1 is 45% identical to Ca-AMP1 but only 35% to hevein. The antifungal activity of Ca-AMP1 and of Bm-AMP1 is similar to that of the Amaranthus (Ac-AMP) proteins; all these proteins are substantially more basic than hevein or the nettle lectin, which may account for the difference in activity. The overall basic nature of the protein contributes to its antifungal effectiveness.
The antifungal activity of these proteins produces an unexpected morphological effect: severe branching of hyphae occurs in partially inhibited germinating fungal spores.
Bm-AMP1 is an isolated antimicrobial protein whose amino acid sequence contains the common cysteine/glycine domain of Chitin-binding Plant Proteins. Such antimicrobial proteins may also be isolated from the seeds of both related and unrelated species. This discovery was referenced across multiple biotechnology patent filings in the 1990s by researchers including Broekaert et al., positioning Briza maxima seed protein as a compound of interest for agricultural biotechnology.
General Grass-Family Constituents
As a member of Poaceae, Briza maxima can be expected to share certain chemical characteristics common to the grass family, including structural carbohydrates (cellulose, hemicellulose), proteins, and lipids in its seeds. However, from a scientific perspective, the validation of big quaking grass's health benefits is an emerging area of interest, and no comprehensive nutritional analysis of its edible portions has been published in peer-reviewed literature at this time.
4. Scientific Evidence by Area of Use
4.1 Antifungal / Antimicrobial Activity
Evidence type: Molecular/biochemical research; patent literature (no clinical human trials).
The most robust scientific evidence for any biological activity in Briza maxima relates to the antifungal properties of Bm-AMP1, isolated from its seeds. Researchers purified Bm-AMP1 from Briza maxima seeds; the protein shares the common cysteine/glycine domain of Chitin-binding Plant Proteins and possesses very potent and broad-spectrum antifungal activity. The antifungal activity of Bm-AMP1 is similar to that of the Amaranthus (Ac-AMP) proteins; all these proteins are substantially more basic than hevein or the nettle lectin, and possession of an overall basic profile contributes to the effectiveness of an antifungal protein.
This work has been cited in subsequent biotechnology research and patent filings. However, it is important to characterise the evidence appropriately: all studies on Bm-AMP1 are laboratory (in vitro) and molecular biology investigations conducted in the context of agricultural biotechnology — specifically the development of transgenic plants with fungal resistance. No human clinical studies on this protein, or on Briza maxima extracts for antifungal purposes, have been published.
4.2 Antioxidant Activity
Evidence type: Preliminary phytochemical; no independent peer-reviewed studies specific to Briza maxima identified.
Preliminary phytochemical analyses indicate that the plant contains bioactive compounds such as flavonoids and phenolic acids, which are known for their antioxidant activity. These compounds may contribute to the potential health-promoting effects attributed to the grass. However, peer-reviewed clinical studies directly assessing big quaking grass in humans remain limited.
The identified flavonoids — including quercetin 3-glucoside, kaempferol 3-glucoside, vitexin, isovitexin, orientin, and iso-orientin — are well characterised in the broader literature as antioxidants. However, evidence of antioxidant activity has not been demonstrated specifically and directly for Briza maxima extracts in any published peer-reviewed study identified during this review. Attributing antioxidant activity to this plant currently rests on chemical inference from the presence of these known compound classes.
4.3 Anti-inflammatory Activity
Evidence type: Claimed in non-peer-reviewed sources; not independently verified in published scientific literature.
Animal and in vitro studies suggest that extracts of Briza maxima possess mild anti-inflammatory and antimicrobial properties, supporting its traditional usage. Despite these promising findings, robust clinical trials are needed to fully establish its efficacy and safety in human nutrition. No peer-reviewed papers specifically reporting anti-inflammatory assays on Briza maxima extracts were identified in the scientific databases searched.
4.4 Food and Nutritional Use
Evidence type: Ethnobotanical documentation.
The seeds are crushed and cooked and used in porridge and bread; the young flowering spikes are eaten raw as a snack. This edible use is recorded in at least two ethnobotanical surveys: one from the Arribes del Duero region of Spain (González et al., 2011) and one from Bosnia-Herzegovina (Redzic, 2006). No nutritional composition studies (macronutrients, micronutrients, glycaemic index, etc.) specific to Briza maxima seeds have been published in the peer-reviewed literature identified during this review.
4.5 Respiratory and Nervous System Applications
Evidence type: Folk tradition only; no scientific evidence.
Claims that big quaking grass was used as a respiratory soother or nervine are recorded in folk tradition sources. Historical records from Europe and parts of Asia highlight its gentle contributions to folk medicine; traditionally, big quaking grass was employed as a soothing agent for mild respiratory complaints, such as coughs and throat irritation, and herbalists brewed its seeds and leaves into infusions or teas, believing that its calming properties could help ease nervous tension and promote restful sleep. No clinical or pre-clinical studies have examined these applications in scientific settings.
5. Body Systems and Health Areas Associated with Briza maxima
Based on the available evidence, the following body systems and health areas are associated with big quaking grass in the literature, though the evidence base varies markedly by area:
- Immune / Antifungal Defense (laboratory/molecular level only): Bm-AMP1 is a potent antifungal seed protein, characterised in agricultural biotechnology research.
- Antioxidant / Oxidative Stress (inferred from phytochemistry): Presence of flavonoids (quercetin glycosides, kaempferol glycosides, vitexin, orientin) consistent with antioxidant potential; not directly tested in published peer-reviewed studies.
- Digestive System (folk tradition): Seeds historically used as a mild diuretic and to support digestive health.
- Respiratory System (folk tradition): Used for coughs and throat irritation in folk medicine.
- Nervous System / Mental Well-being (folk tradition): Infusions said to ease nervous tension and promote sleep.
- Skin (folk tradition): Poultices applied for minor skin irritations.
- Nutrition / Metabolic (historical food use): Seeds and young spikes consumed as food.
- Respiratory Allergy (safety consideration — see below): As a member of Poaceae, Briza maxima pollen is a potential aeroallergen in sensitised individuals.
6. Dosage Forms and Reported Dosages
No clinical trials have been conducted on Briza maxima as a dietary supplement, and therefore no evidence-based dosage recommendations exist in the peer-reviewed literature. The plant has been used in the following forms:
- Infusion/tea: Seeds and/or leaves brewed into herbal infusions, as recorded in folk medicine tradition. No standardised dosage or preparation protocol has been described in the scientific literature.
- Poultice: Whole plant or leaf material applied topically; no standardised preparation described in scientific sources.
- Whole food: Seeds crushed and cooked for porridge and bread; young flowering spikes eaten raw as a snack. No quantitative dosage recorded.
- Crude extract / isolated protein (research only): Bm-AMP1 has been studied in laboratory antifungal assays. No dosage information relevant to human therapeutic use exists.
Robust clinical trials are needed to fully establish the efficacy and safety of big quaking grass in human nutrition. Current scientific literature encourages further research to explore the potential of big quaking grass as a functional ingredient in nutritional products.
7. Safety Considerations
General Safety Profile
Peer-reviewed clinical studies directly assessing big quaking grass in humans remain limited. The absence of human trial data means that a definitive safety profile for Briza maxima as a dietary supplement has not been established. The plant's traditional use as a food ingredient (seeds and young spikes) across multiple cultures suggests that ordinary food-level exposure is tolerated, but no formal safety studies, toxicology reports, or adverse event data specific to Briza maxima have been published in the peer-reviewed sources identified during this review.
Pollen Allergenicity
A critical, source-backed safety consideration for Briza maxima is its status as a member of the Poaceae family. Poaceae pollen is currently regarded as the leading airborne biological pollutant and the chief cause of pollen allergy worldwide. In Poaceae, although species belonging to different subfamilies are characterised by distinct allergen subsets, there is a considerable degree of cross-reactivity between many species. Depending on the climate and regional characteristics, sensitivity to Poaceae pollen can reach up to 30% of the population. Exposure to Poaceae pollen causes symptoms of allergic rhinoconjunctivitis and/or asthma in sensitive individuals.
This is particularly relevant for any person with existing grass pollen allergy who might be exposed to Briza maxima pollen (e.g., in gardens or meadows where the plant naturalises), or who consumes preparations made from its seeds or leaves. In patients with respiratory allergy, cross-reactivity between aeroallergens and foods may induce food allergy, with symptoms ranging from oral allergy syndrome to severe anaphylaxis.
Invasive Potential and Exposure Risk
Great quaking grass is considered invasive in California. Briza maxima (big quaking grass, rattlesnake grass) is a winter annual grass located throughout the coastal ranges of California; it is, on occasion, grown for its ornamental panicles but has spread into many grassland regions where it can be the dominant species. This ecological spread increases human pollen exposure in regions where the plant has naturalised.
Drug and Supplement Interactions
No peer-reviewed studies have investigated drug or supplement interactions for Briza maxima. Given the absence of pharmacokinetic data, no evidence-based interaction statements can be made.
Regulatory and Monograph Status
Briza maxima does not appear in any WHO monographs, ESCOP monographs, German Commission E monographs, the European Pharmacopoeia, or the USP as a regulated medicinal plant. It is not listed as a dietary supplement with established safety or efficacy status by the NIH Office of Dietary Supplements or the European Food Safety Authority (EFSA) in any monograph or opinion document identified in this review. While historical use and early scientific data highlight the potential contributions of big quaking grass, definitive evidence for its health effects awaits further investigation. Its longstanding presence in traditional medicine and the discovery of beneficial phytochemicals nonetheless underscore its promise as a natural ingredient in modern nutritional contexts.
8. Summary of Evidence Quality
- Botanical identity and distribution: Well established (Kew POWO, Wikipedia, NCSU Extension, Edible Plant DB, Cal-IPC).
- Flavonoid phytochemistry: Published peer-reviewed evidence exists for the genus (Phytochemistry, ScienceDirect), with specific profiling of Briza maxima noted as distinctive from other Eurasian Briza species.
- Bm-AMP1 antifungal protein: Documented in patent literature and referenced in peer-reviewed biotechnology literature; evidence is laboratory/molecular only with no human applications studied.
- Traditional medicinal uses (respiratory, digestive, sedative, skin): Supported only by folk medicine records and non-peer-reviewed sources; no human clinical data exist.
- Food use (seeds, spikes): Documented in ethnobotanical surveys from Spain and Bosnia-Herzegovina.
- Anti-inflammatory and antioxidant activity: Claimed on the basis of phytochemical inference; no direct peer-reviewed experimental evidence for Briza maxima specifically identified.
- Dosage: No evidence-based dosage exists; no clinical trials have been conducted.
- Safety: No formal toxicology studies published; pollen allergenicity is a documented class-level concern for the Poaceae family.
Overall evidence assessment: Briza maxima is a botanically well-characterised annual grass with confirmed edible uses and a distinctive leaf flavonoid profile. Its only rigorously studied bioactive compound, Bm-AMP1, has been characterised in agricultural biotechnology contexts. All claimed therapeutic or nutraceutical applications rest on folk tradition and preliminary phytochemical inference, without support from human clinical trials. The plant does not appear in any official pharmacopoeial or government-body monograph as a recognised medicinal plant or dietary supplement.
References
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