Plant Comparison
Hawthorn vs Japanese knotweed
A side-by-side comparison of two medicinal plants — every documented constituent, action, use, safety note and cited source, assembled automatically from the Omnia Sana database.
At a glance
Hawthorn and Japanese knotweed: they share 5 indicated uses (arthritis / joint pain, cancer (anticancer research), cardiovascular / heart health, …); 3 pharmacological actions in common.
Evidence face-off — shared uses
| Condition | Hawthorn | Japanese knotweed | Verdict |
|---|---|---|---|
| Arthritis / joint pain | 1/10 | 2/10 | Comparable evidence |
| Cancer (anticancer research) | 2/10 | 2/10 | Comparable evidence |
| Cardiovascular / heart health | 1/10 | 1/10 | Comparable evidence |
| Inflammation (general) | 1/10 | 7/10 | Stronger for Japanese knotweed |
| Skin irritation | 1/10 | 1/10 | Comparable evidence |
Evidence scores (1–10) are computed from the tier of each cited source. “Comparable” means the two scores are within one point. Follow a score to its detailed sources.
Key Constituents
Principal cardioprotective and antioxidant polyphenols characterised by chemical profiling of leaf, flower and fruit.
Contribute to the vasoactive and antioxidant effects, the basis for extract standardisation.
Considered the principal bioactive constituents, responsible for much of the antioxidant, anti-inflammatory and cardioprotective activity attributed to this root.
Emodin has laxative and anti-inflammatory activity at typical concentrations but can cause gastrointestinal upset at high doses.
Pharmacological Actions
Traditional & Indicated Uses
inferred from anti-inflammatory action
inferred from anticancer action
inferred from anti-inflammatory action
inferred from sedative action
inferred from anti-inflammatory action
inferred from anticancer action
inferred from anti-inflammatory action
Safety, Cautions & Contraindications
Generally well tolerated. Hawthorn should not replace prescribed cardiac medications without medical supervision. May potentiate the effects of cardiac glycosides (digoxin), antihypertensive drugs, and coronary dilators. Not recommended during pregnancy and breastfeeding due to insufficient safety data. Mild side effects (nausea, dizziness, GI upset) occasionally reported.
Duke (2002) rates hawthorn as +++ — one of the most clinically supported cardiovascular herbs. Clinical evidence (score 2) supports its use for decreasing cardiac output (NYHA functional Stage II heart failure), as recognized by Commission E. Key activities include vasodilation, positive inotropic effects, and antioxidant protection of vascular tissue. Dose: 160–900 mg standardized leaf/flower extract (containing 18.75% oligomeric proanthocyanidins) daily. Duke emphasizes that hawthorn should not replace conventional heart failure therapy, and therapeutic effects may take 4–8 weeks to emerge. Mild interactions with cardiac glycosides (digitalis) are possible (Duke, 2002).
Japanese knotweed root contains resveratrol and emodin; high doses of emodin may cause GI discomfort and have laxative effects. Not recommended during pregnancy (emodin has potential teratogenic effects in animal studies). May interact with anticoagulants and antiplatelet medications. Quality control of commercial preparations is important as invasive weed extracts vary significantly.
Duke (2002) rates Japanese knotweed (listed as Hu-Zhang, Fallopia japonica) as +++ and highlights its rich content of resveratrol and emodin. Experimental evidence (score 1) supports COX-2 inhibitory, antioxidant, anti-inflammatory, hepatoprotective, and lipid-lowering activities — largely attributed to resveratrol. Duke notes its use in traditional Chinese medicine for fractures, burns, abscesses, and gynecological conditions. No significant clinical trials were available at time of publication, but resveratrol's biological activity is well-documented in vitro (Duke, 2002).
External Ids
Botanical Description
Small deciduous tree or large shrub, densely thorny, with deeply lobed, glossy leaves (more deeply cut than midland hawthorn). Clusters of small, five-petalled white flowers with a strong, musky scent appear in spring ('May blossom'), followed by small red berries (haws), each containing a single seed (nutlet) - the origin of the species name monogyna.[4]
Vigorous, invasive rhizomatous perennial (Polygonaceae) with hollow, bamboo-like, jointed stems 1-3 m tall (occasionally taller), speckled reddish-purple. Leaves are broad, heart- to shovel-shaped with a flat base. Abundant sprays of small, creamy-white flowers appear in late summer, followed by small winged fruit.[6]
Habitat
One of the commonest hedgerow and scrub trees of Europe, growing in hedgerows, woodland edges, scrub and pasture on a wide range of soils; native to Europe, North Africa and Western Asia.[4]
Native to East Asia (Japan, China, Korea), now a notorious invasive species across Europe and North America, growing in disturbed ground, riverbanks, roadsides and waste land, spreading aggressively via an extensive rhizome network.[6]
Harvesting
Flowers are picked as they open in May, leaves are picked with the young flowering shoots, and the ripe red berries (haws) are gathered in autumn after the first frosts soften them slightly; all three parts are traditionally combined.[4]
The rhizome/root, the main medicinal part, is dug in autumn or winter when resveratrol content is highest; young spring shoots (stems) are also edible and used. Strict containment is required when harvesting, given the plant's severe invasiveness.[6]
Traditional Uses
Common hawthorn shares the same long cardiovascular and calming tradition as midland hawthorn, used across European herbal medicine as a heart tonic for mild circulatory complaints, palpitations and nervous tension, and remains one of the most clinically studied cardiovascular botanicals.[4]
Known as Hu Zhang in Traditional Chinese Medicine, Japanese knotweed root has a centuries-old use for inflammation, infections, jaundice and menstrual complaints. Modern interest centres on its resveratrol and emodin content, now studied (as Polygonum cuspidatum extract) for antioxidant, anti-inflammatory, cardioprotective and hepatoprotective activity, and more recently for supportive use in acute respiratory infections.[2, 3, 6]
Preparations
Leaf-and-flower extract standardised to flavonoid or procyanidin content, taken as tablets or capsules; the best-studied clinical form.
Dosage
The EU herbal monograph on Crataegus spp., folium cum flore gives dry extracts in divided daily doses of 240-900 mg (single dose 80-450 mg) or, for one quantified extract, 570-1750 mg daily (single dose 190-350 mg), in adults and elderly. If symptoms persist longer than 2 weeks a doctor should be consulted, and hawthorn is never used as a substitute for prescribed heart medication without medical supervision. Educational reference only, not a prescription.
The EU herbal monograph gives 1-2 g of the comminuted leaf and flower in 150 mL of boiling water as an infusion, up to 4 times daily (maximum 6 g daily), in adults and elderly. Educational reference only, not a prescription.
Duke (2002) and general phytotherapy guidance treat this as an experimentally supported herb without a single agreed clinical dose; commercial resveratrol-standardised extracts should be dosed per product labelling. Educational reference only, not a prescription; avoid in pregnancy.
References
Drug Class Interactions
Not documented
Lookalikes Review
References & Sources
- Ez-Zahra Amrati, F., Mssillou, I., Boukhira, S., Djiddi Bichara, M. et al (2024) 'Phenolic Composition of Crataegus monogyna Jacq. Extract and Its Anti-Inflammatory, Hepatoprotective, and Antileukemia Effects', Pharmaceuticals (Basel), 17(6), pp. 786. doi:10.3390/ph17060786 Preclinical
https://doi.org/10.3390/ph17060786 - Lis, M., Szczypka, M., Suszko-Pawłowska, A., Sokół-Łętowska, A. et al (2019) 'Hawthorn (Crataegus monogyna) Phenolic Extract Modulates Lymphocyte Subsets and Humoral Immune Response in Mice', Planta Medica, 86(2), pp. 160-168. doi:10.1055/a-1045-5437 Preclinical
https://doi.org/10.1055/a-1045-5437 - Paun, G., Neagu, E., Albu, C., Alecu, A. et al (2024) 'Antioxidant and Antidiabetic Activity of Crataegus monogyna L. and Cornus mas Fruit Extracts', Molecules, 29(15), pp. 3595. doi:10.3390/molecules29153595 Preclinical
https://doi.org/10.3390/molecules29153595 - Nabavi, S.F., Habtemariam, S., Ahmed, T., Sureda, A., Daglia, M. and Sobarzo-Sanchez, E (2015) 'Polyphenolic Composition of Crataegus monogyna Jacq.: From Chemistry to Medical Applications', Nutrients, 7(9), pp. 7708-7728. doi:10.3390/nu7095361 Meta-analysis / review
https://doi.org/10.3390/nu7095361 - Belabdelli, F., Bekhti, N., Piras, A., Benhafsa, F.M., Ilham, M. and Adil, S (2021) 'Chemical composition, antioxidant and antibacterial activity of Crataegus monogyna leaves' extracts', Natural Product Research, 36(12), pp. 3234-3239. doi:10.1080/14786419.2021.1958215 Preclinical
https://doi.org/10.1080/14786419.2021.1958215 - Jalali, A.S., Hasanzadeh, S. and Malekinejad, H (2012) 'Crataegus monogyna aqueous extract ameliorates cyclophosphamide-induced toxicity in rat testis: stereological evidences', Acta Medica Iranica, 50(1), pp. 1-8. Preclinical
https://scholar.google.com/scholar?q=Crataegus%20monogyna%20aqueous%20extract%20ameliorates%20cyclophosphamide-induced%20toxicity%20in%20rat%20testis%3A%20stereological%20evidences - Martin-Garcia, B., Razola-Diaz, M.D.C., Gomez-Caravaca, A.M., Benitez, G. and Verardo, V (2021) 'Setup of an Ultrasonic-Assisted Extraction to Obtain High Phenolic Recovery in Crataegus monogyna Leaves', Molecules, 26(15), pp. 4536. doi:10.3390/molecules26154536 Preclinical
https://doi.org/10.3390/molecules26154536 - Arslan, R., Bektas, N., Bor, Z. and Sener, E (2014) 'Evaluation of the antithrombotic effects of Crataegus monogyna and Crataegus davisii in the carrageenan-induced tail thrombosis model', Pharmaceutical Biology, 53(2), pp. 275-279. doi:10.3109/13880209.2014.914957 Preclinical
https://doi.org/10.3109/13880209.2014.914957 - Edwards, J.E., Brown, P.N., Talent, N., Dickinson, T.A. and Shipley, P.R (2012) 'A review of the chemistry of the genus Crataegus', Phytochemistry, 79, pp. 5-26. doi:10.1016/j.phytochem.2012.04.006 Meta-analysis / review
https://doi.org/10.1016/j.phytochem.2012.04.006 - Jarzycka, A., Lewinska, A., Gancarz, R. and Wilk, K.A (2013) 'Assessment of extracts of Helichrysum arenarium, Crataegus monogyna, Sambucus nigra in photoprotective UVA and UVB; photostability in cosmetic emulsions', Journal of Photochemistry and Photobiology B: Biology, 128, pp. 50-57. doi:10.1016/j.jphotobiol.2013.07.029 Preclinical
https://doi.org/10.1016/j.jphotobiol.2013.07.029 - Lucconi, G., Chlapanidas, T., Martino, E., Gaggeri, R., Perteghella, S. and Rossi, D (2013) 'Formulation of microspheres containing Crataegus monogyna Jacq. extract with free radical scavenging activity', Pharmaceutical Development and Technology, 19(1), pp. 65-72. doi:10.3109/10837450.2012.752387 Preclinical
https://doi.org/10.3109/10837450.2012.752387 - Zorniak, M., Szydlo, B. and Krzeminski, T.F (2017) 'Crataegus special extract WS 1442: up-to-date review of experimental and clinical experiences', Journal of Physiology and Pharmacology, 68(4), pp. 521-526. Meta-analysis / review
https://scholar.google.com/scholar?q=Crataegus%20special%20extract%20WS%201442%3A%20up-to-date%20review%20of%20experimental%20and%20clinical%20experiences - European Medicines Agency (2016) 'European Union herbal monograph on Crataegus spp., folium cum flore'. Traditional / reference
https://scholar.google.com/scholar?q=European%20Union%20herbal%20monograph%20on%20Crataegus%20spp.%2C%20folium%20cum%20flore - Pittler, M.H., Guo, R. and Ernst, E (2008) 'Hawthorn extract for treating chronic heart failure'. Traditional / reference
https://scholar.google.com/scholar?q=Hawthorn%20extract%20for%20treating%20chronic%20heart%20failure - Royal Botanic Gardens, Kew (n.d.). Available at: https://powo.science.kew.org Traditional / reference
https://powo.science.kew.org - Duke, J.A (2002) 'Handbook of Medicinal Herbs, Second Edition'. Traditional / reference
https://scholar.google.com/scholar?q=Handbook%20of%20Medicinal%20Herbs%2C%20Second%20Edition - Tankanow, R., Tamer, H.R., Streetman, D.S., Smith, S.G., Welton, J.L., Annesley, T., Aaronson, K.D. and Bleske, B.E (2003) 'Interaction study between digoxin and a preparation of hawthorn (Crataegus oxyacantha)', Journal of Clinical Pharmacology, 43(6), pp. 637-642. doi:10.1177/0091270003253417 Randomized trial
https://doi.org/10.1177/0091270003253417 - Pittler, M.H., Guo, R. and Ernst, E (2008) 'Hawthorn extract for treating chronic heart failure', Cochrane Database of Systematic Reviews, 2008(1), pp. CD005312. doi:10.1002/14651858.CD005312.pub2 Meta-analysis / review
https://doi.org/10.1002/14651858.CD005312.pub2 - Pittler, M.H., Guo, R. and Ernst, E (2008) 'Hawthorn extract for treating chronic heart failure', Cochrane Database of Systematic Reviews, 2008(1), pp. CD005312. doi:10.1002/14651858.CD005312.pub2 Meta-analysis / review
https://doi.org/10.1002/14651858.CD005312.pub2 - Ghasemzadeh Rahbardar, M. and Hosseinzadeh, H (2024) 'Therapeutic potential of hypnotic herbal medicines: A comprehensive review', Phytotherapy Research, 38(6), pp. 3037-3059. doi:10.1002/ptr.8201 Meta-analysis / review
https://doi.org/10.1002/ptr.8201 - Block, K.I., Gyllenhaal, C. and Mead, M.N (2004) 'Safety and efficacy of herbal sedatives in cancer care', Integrative Cancer Therapies, 3(2), pp. 128-148. doi:10.1177/1534735404265003 Meta-analysis / review
https://doi.org/10.1177/1534735404265003
- Dong, X., Fu, J., Yin, X., Cao, S. and others (2016) 'Emodin: A Review of its Pharmacology, Toxicity and Pharmacokinetics', Phytotherapy Research, 30(8), pp. 1207-1218. doi:10.1002/ptr.5631 Traditional / reference
https://doi.org/10.1002/ptr.5631 - Wang, S., Yang, Y., Sun, L., Qiao, G. and others (2022) 'Reynoutria japonica Houtt for Acute Respiratory Tract Infections in Adults and Children: A Systematic Review', Frontiers in Pharmacology, 13, pp. 787032. doi:10.3389/fphar.2022.787032 Meta-analysis / review
https://doi.org/10.3389/fphar.2022.787032 - Ke, Y., Zhan, L., Lu, T., Zhou, C. and others (2023) 'Advances for pharmacological activities of Polygonum cuspidatum (Reynoutria japonica) - A review', Pharmaceutical Biology, 61(1), pp. 177-188. doi:10.1080/13880209.2022.2158349 Traditional / reference
https://doi.org/10.1080/13880209.2022.2158349 - Zhang, Q., Zhao, Y., Zhang, M., Zhang, Y. and others (2021) 'Bioactive amides from Reynoutria japonica', Journal of Asian Natural Products Research, 23(3), pp. 228-234. doi:10.1080/10286020.2021.1873298 Preclinical
https://doi.org/10.1080/10286020.2021.1873298 - Lai, Y., Zhou, C., Huang, P., Dong, Z. and others (2024) 'Polygonum cuspidatum polysaccharide: A review of its extraction and purification, structure analysis, and biological activity', Journal of Ethnopharmacology, 331, pp. 118079. doi:10.1016/j.jep.2024.118079 Traditional / reference
https://doi.org/10.1016/j.jep.2024.118079 - Peng, W., Qin, R., Li, X. and Zhou, H (2013) 'Botany, phytochemistry, pharmacology, and potential application of Polygonum cuspidatum Sieb. et Zucc.: a review', Journal of Ethnopharmacology, 148(3), pp. 729-745. doi:10.1016/j.jep.2013.05.007 Traditional / reference
https://doi.org/10.1016/j.jep.2013.05.007 - Wang, X., Liang, L., Yan, J., Li, Z. and others (2023) 'Citri Reticulatae Pericarpium-Reynoutria japonica Houtt. herb pair suppresses breast cancer liver metastasis by targeting ECM1-mediated cholesterol biosynthesis pathway', Phytomedicine, 116, pp. 154896. doi:10.1016/j.phymed.2023.154896 Preclinical
https://doi.org/10.1016/j.phymed.2023.154896 - Jiang, Y., Liu, Y., Zhang, X. and others (2020) 'New phenolic glycosides from Reynoutria japonica', Journal of Asian Natural Products Research, 22(1), pp. 17-23. doi:10.1080/10286020.2019.1646730 Preclinical
https://doi.org/10.1080/10286020.2019.1646730 - Liu, Y., Wang, J., Li, Q. and others (2024) 'The Possibility of Polygonum cuspidatum against Osteoarthritis based on Network Pharmacology', Current Computer-Aided Drug Design, 20(2), pp. 121-133. doi:10.2174/1573409919666230403114131 Preclinical
https://doi.org/10.2174/1573409919666230403114131 - Espinosa-Andrews, H., Morales-Hernandez, N., Garcia-Marquez, E. and others (2025) 'Physicochemical and rheological characteristics of commercial Greek-style yogurt enriched with Polygonum cuspidatum roots or the P. cuspidatum beta-cyclodextrin inclusion complex', Food Research International, 203, pp. 115854. doi:10.1016/j.foodres.2025.115854 Preclinical
https://doi.org/10.1016/j.foodres.2025.115854 - Burns, J., Yokota, T., Ashihara, H., Lean, M.E.J. and Crozier, A (2002) 'Plant foods and herbal sources of resveratrol', 50(11), pp. 3337--3340. doi:10.1021/jf0112973 Traditional / reference
https://doi.org/10.1021/jf0112973 - Royal Botanic Gardens, Kew (n.d.). Available at: https://powo.science.kew.org Traditional / reference
https://powo.science.kew.org - World Health Organization (2007) 'WHO Monographs on Selected Medicinal Plants'. Traditional / reference
https://scholar.google.com/scholar?q=WHO%20Monographs%20on%20Selected%20Medicinal%20Plants - Duke, J.A (2002) 'Handbook of Medicinal Herbs, Second Edition'. Traditional / reference
https://scholar.google.com/scholar?q=Handbook%20of%20Medicinal%20Herbs%2C%20Second%20Edition
Generated automatically from the Omnia Sana plant database and its cited sources. For educational purposes only — not medical advice. Always consult a qualified practitioner before using medicinal plants.