Pi Pa Hua

Pi Pa Hua (Loquat Flower) is the dried flower or flower bud of Eriobotrya japonica (Thunb.) Lindl., an evergreen broad-leaved tree in the family Rosaceae. In the traditional TCM classification system, Pi Pa Hua is considered bitter in flavor and micro-cold in nature. It enters the Lung meridian, giving it a folk reputation for resolving phlegm, relieving cough, and clearing Lung heat. Unlike the more widely recognized Pi Pa Ye (loquat leaf), Pi Pa Hua is primarily a folk herb used in regional TCM practice, particularly in southern China.

Botanical description: Eriobotrya japonica is an evergreen shrub or small tree growing to 5–10 meters in height. It has large, oblong-lanceolate leaves 10–25 cm long with a leathery texture, glossy dark green adaxial surface, and densely tomentose abaxial surface. The tree flowers in late autumn to winter (October–December), producing terminal panicles of fragrant, creamy-white flowers approximately 1–2 cm in diameter. Each flower has five petals and is covered with a dense rusty tomentum. The flowers give way to yellow-orange, pear-shaped fruits that ripen in spring. The dried flower buds used medicinally are small, densely pubescent, and retain a characteristic faintly sweet, slightly astringent aroma.

Habitat and cultivation: E. japonica is native to southeastern China and is widely cultivated throughout southern China, particularly in Guangdong, Guangxi, Fujian, Zhejiang, and Sichuan provinces. It is also grown in Japan, Korea, India, and the Mediterranean region. The tree thrives in subtropical to warm temperate climates with well-drained, slightly acidic soils. For medicinal purposes, the flower buds are typically collected in winter (November to January) before full opening, then cleaned and dried in the sun or in a ventilated area. Folk practitioners in Guangdong and Guangxi have a long history of using the dried flowers in decoctions for respiratory complaints.

Distinction from Pi Pa Ye: While Pi Pa Ye (loquat leaf) is officially listed in the Chinese Pharmacopoeia as a standard medicinal material with defined quality markers, Pi Pa Hua (loquat flower) is not included as a separate monograph in most pharmacopoeial standards. The flower is primarily documented in folk herbal records, regional medicinal plant surveys, and ethnomedicinal literature. Both parts contain triterpenes (ursolic acid and oleanolic acid) as major constituents, but the flower has been significantly less studied from a pharmacological perspective.

In the traditional Chinese medicine theoretical framework, Pi Pa Hua is understood primarily as a Lung-targeting herb that resolves phlegm, relieves cough, and clears Heat from the Lung. Its bitter and micro-cold nature makes it suitable for Heat-type respiratory patterns, while its phlegm-resolving properties address both the production and the retention of pathological phlegm in the Lung.

Resolving phlegm and relieving cough: Pi Pa Hua is traditionally considered one of the folk remedies of choice for cough with productive sputum, especially when the sputum is yellow, thick, or difficult to expectorate — signs of Phlegm-Heat in the Lung. In TCM theory, the bitter flavor helps to direct Qi downward and resolve phlegm, while the micro-cold nature clears Heat from the respiratory tract. Folk practitioners in Guangdong commonly combine Pi Pa Hua with Jin Yin Hua (honeysuckle flower), Sang Ye (mulberry leaf), and Jie Geng (platycodon root) in decoctions for Lung Heat cough. The herb is often used for both acute and chronic cough presentations in folk practice.

Clearing Lung Heat: When Wind-Heat or Lung Heat manifests as a cough with yellow sputum, sore throat, and a red tongue with yellow coating, Pi Pa Hua is traditionally used to clear the Heat and soothe the Lung. Its micro-cold nature is considered appropriate for these Heat-type presentations. In southern Chinese folk medicine, Pi Pa Hua tea or decoction is sometimes consumed during the winter months as a preventive measure for respiratory conditions, reflecting the folk belief that the flower's Lung-cleansing properties can help maintain respiratory health during the cold season.

Folk literature references: Pi Pa Hua is documented in several regional Chinese herbal compendia and folk medicine texts. The Guangdong Zhong Yao Zhi (Guangdong Chinese Materia Medica Records) describes Pi Pa Hua as useful for resolving phlegm and relieving cough. Various folk herbal manuals from Guangdong and Guangxi list Pi Pa Hua in household remedy formulas for winter cough and bronchial discomfort. The flower is also mentioned in ethnomedicinal surveys of the Rosaceae family plants used in southern Chinese traditional medicine. While these records reflect long-standing folk use, they do not carry the same level of systematic documentation as the classical formulas that feature Pi Pa Ye.

Pi Pa Hua contains a range of bioactive compounds, some of which overlap with the better-characterized loquat leaf. The following overview summarizes the major chemical constituents identified in the flower of Eriobotrya japonica and what is currently known from published research.

Triterpenes (ursolic acid and oleanolic acid): Ursolic acid and oleanolic acid are pentacyclic triterpenoids and the most pharmacologically significant compounds identified in Eriobotrya japonica. An HPLC study by Zhou et al. (2007) specifically quantified ursolic acid and oleanolic acid in loquat flowers. These triterpenes have been extensively studied for anti-inflammatory, antioxidant, hepatoprotective, and potential anti-tumor activities in pre-clinical research. A study by Tan et al. (2019) confirmed that ursolic acid isolated from E. japonica exhibited anti-inflammatory activity through molecular pathways involving NF-κB inhibition. Kuraoka-Oliveira et al. (2020) demonstrated anti-inflammatory and anti-arthritic activity of E. japonica leaf extracts containing ursolic acid, oleanolic acid, and corosolic acid.

Flavonoids and phenolic compounds: The flower of E. japonica contains flavonoids and phenolic compounds that have attracted research interest for their antioxidant and anti-inflammatory potential. A 2026 study by Moratilla-Rivera et al. characterized loquat flowers as a rich but underexplored phenolic source, noting that the flowers may even exceed the leaves in certain phenolic content. These compounds contribute to the overall antioxidant profile of the flower and may play a role in its traditional use for respiratory conditions involving oxidative stress and inflammation.

Volatile oils: The flowers of E. japonica contain volatile oil components that contribute to their characteristic aroma. While the volatile oil composition of loquat flowers has been less extensively characterized than that of the leaf, the fragrance of the flowers suggests the presence of terpenoid and aromatic compounds. Volatile oils from E. japonica have been studied for potential antimicrobial and anti-inflammatory properties.

Other constituents: The Zhou et al. (2007) HPLC study also identified amygdalin (a cyanogenic glycoside) in loquat flowers. Additionally, trace amounts of other secondary metabolites may be present. The overall phytochemical profile of the flower has been significantly less thoroughly characterized than that of the leaf.

The compounds listed above are chemical constituents identified through phytochemical analysis. Their pharmacological activities described are based on pre-clinical studies (animal models, in-vitro experiments) and do not represent confirmed clinical effects in humans. Much of the research cited has been conducted on loquat leaf rather than flower specifically.

Pi Pa Hua is a folk herb and does not appear as an ingredient in the major classical formula texts such as the Shang Han Lun or Wen Bing Tiao Bian. However, it is used in regional folk formula traditions, and its clinical applications overlap with well-known classical formulas that address similar Lung Heat patterns. Below are descriptions of traditional folk combinations featuring Pi Pa Hua, along with a related classical formula used for comparable indications.

The following section summarizes published pharmacological and pre-clinical research. Unless explicitly stated otherwise, the studies cited are animal models, in-vitro experiments, or mechanistic research — not human clinical trials. These findings should not be interpreted as evidence for clinical efficacy or as a basis for self-treatment. Most research on Eriobotrya japonica has been conducted on the leaf rather than the flower specifically.

Anti-inflammatory effects of triterpene acids: The triterpene acids in E. japonica — particularly ursolic acid and oleanolic acid — have been the most extensively studied compounds from this plant. A comprehensive review by Zhu et al. (2022) in the Journal of Ethnopharmacology summarized the pharmacological activities of E. japonica leaves, identifying 164 compounds and noting that triterpenes and flavonoids are the most important bioactive compounds responsible for anti-inflammatory, antidiabetic, and antitumor activities. Zhou et al. (2019) demonstrated that ursolic acid from E. japonica exhibited anti-inflammatory activity at the molecular level by suppressing LPS-induced upregulation of NF-κB subunits and pro-inflammatory genes (ICAM-1, TNF-α, iNOS, COX-2). Kuraoka-Oliveira et al. (2020) showed anti-inflammatory and anti-arthritic activity of E. japonica leaf extract in animal models, with chromatographic analysis confirming the presence of corosolic acid, oleanolic acid, and ursolic acid.

Antitussive and bronchodilatory effects: The Zhu et al. (2022) review noted that triterpenes from E. japonica leaves have demonstrated antitussive, expectorant, and bronchodilatory effects in pre-clinical studies, as well as tracheal smooth muscle relaxation. These findings provide some pharmacological basis for the traditional use of loquat in cough and respiratory conditions. Huang et al. (2007) demonstrated that triterpene acids from E. japonicaleaf inhibited inflammatory cytokine and mediator induction from alveolar macrophages in a rat model of chronic bronchitis. However, these studies were conducted using leaf extracts rather than flower extracts, and the direct relevance to Pi Pa Hua is uncertain.

Antioxidant and phenolic content of loquat flowers: A 2026 study by Moratilla-Rivera et al., published in Nutrients, specifically examined loquat flowers and characterized them as a rich but underexplored phenolic source. The study found that loquat flowers contain significant phenolic compounds with antioxidant potential, and the flowers may exceed the leaves in certain phenolic content metrics. This study provides the most direct evidence for the bioactive potential of E. japonica flowers specifically, though it remains a preliminary phytochemical characterization rather than a clinical efficacy study.

Phytochemical analysis of loquat flowers: Zhou et al. (2007) developed and validated HPLC methods for the determination of oleanolic acid, ursolic acid, and amygdalin in loquat flowers, providing quantitative data on the presence of these key compounds in the flower material. This study is important because it directly analyzed the flower rather than the leaf, establishing the presence of pharmacologically relevant triterpenes in Pi Pa Hua.

What the research does NOT show: Despite promising phytochemical and pre-clinical data, the research does NOT demonstrate conclusive clinical efficacy for Pi Pa Hua in treating any specific disease in humans. There are no large-scale, randomized, placebo-controlled clinical trials for Pi Pa Hua (loquat flower). Most published studies focus on the leaf (Pi Pa Ye) rather than the flower. The existing flower-specific research is limited to phytochemical identification and quantification. The translation from in-vitro and animal studies on isolated compounds to clinical effects of whole-herb Pi Pa Hua preparations in humans is uncertain. This page does not endorse Pi Pa Hua as a treatment for any condition.

Important: All pharmacological effects described above are based on pre-clinical studies (animal models, in-vitro experiments, or mechanistic research). They do not constitute evidence of clinical efficacy in humans. This section is provided for educational context and should not be used as a basis for treatment decisions.

General safety profile: Pi Pa Hua has a long history of folk use in southern China and is generally regarded as having a mild safety profile when used in traditional decoctions. However, because Pi Pa Hua is not a pharmacopoeial herb, systematic toxicological data are limited. The safety information below reflects what is currently known from published research on Eriobotrya japonica and traditional clinical experience.

Spleen deficiency-cold patterns: In traditional TCM theory, Pi Pa Hua is micro-cold and bitter in nature. Individuals with Spleen deficiency-cold — characterized by abdominal distension, loose stools, poor appetite, fatigue, and a pale tongue with white coating — should use Pi Pa Hua with caution. Its micro-cold nature may theoretically worsen cold-damp patterns in the Spleen and Stomach. Pi Pa Hua should only be used under professional guidance with appropriate warming herbs when Spleen deficiency coexists with Lung Heat.

Cold-phlegm patterns: Because Pi Pa Hua is micro-cold and indicated for Heat-type respiratory patterns, it is traditionally considered inappropriate for cold-phlegm cough — characterized by copious thin white sputum, a preference for warm drinks, and a white-coated tongue. Using a cold-natured herb for a cold pattern may theoretically worsen the condition.

Pregnancy and lactation: There is insufficient modern safety data on the use of Pi Pa Hua during pregnancy. Because of its micro-cold nature, it is traditionally considered that pregnant women with Spleen deficiency-cold patterns should use it with caution. The flower has not been formally classified in the Chinese Pharmacopoeia with specific pregnancy contraindications. Do not use Pi Pa Hua during pregnancy without direct supervision from a qualified healthcare professional.

Drug interactions: Pre-clinical data on triterpenes from E. japonica suggest theoretical potential for interactions with medications metabolized by cytochrome P450 enzymes or with anti-inflammatory drugs. However, clinical interaction data for Pi Pa Hua specifically are essentially nonexistent. Consult a qualified healthcare professional before combining Pi Pa Hua with any prescription medications.

Amygdalin content: The Zhou et al. (2007) study identified amygdalin in loquat flowers. Amygdalin is a cyanogenic glycoside that can release small amounts of cyanide upon metabolism. While the amounts in loquat flowers are generally considered low, individuals with specific sensitivities or those consuming very large quantities should be aware of this constituent.

Reported side effects: Systematic adverse event data for Pi Pa Hua are not available in the published literature. Based on its traditional use profile, side effects are generally considered rare and mild. The Zhu et al. (2022) review noted that high doses of E. japonica leaf extracts showed no side effects or toxicity symptoms in laboratory animals, though this does not directly apply to the flower. Any suspected adverse effects should be reported to a healthcare professional.

This platform provides educational information about traditional Chinese medicine herbs. It does not recommend, endorse, or prescribe the use of Pi Pa Hua or any other herbal product for the treatment of any medical condition. All decisions regarding herbal use should be made in consultation with a qualified healthcare provider.