Eden Apothecary · Herb Profile
Hydrangea arborescens
Also known as Seven Barks
Pronounced Hydrangea (Seven Barks): hy-DRAYN-jee-uh, SEV-uhn barks. Hydrangea arborescens: hy-DRAYN-jee-uh ar-buh-RESS-enz.
Cool and drying: a relaxing, solvent-diuretic root that cools urinary heat, eases the spasm and irritation of an inflamed bladder and prostate, and helps move and pass gravel and stone.
No pre-1900 source found for this reading.
Avoid in pregnancy. Modern references advise against use for want of safety data, and the root's cyanogenic glycoside (hydrangin) and emetic quinazoline alkaloids (febrifugine, isofebrifugine) add specific reasons for caution. The Southern Cross University medicinal-plant monograph states that the use of hydrangea during pregnancy and lactation should be avoided due to the lack of pharmacological and toxicity data, and Healthline advises that, because of the lack of information on the toxicity of the root, people who are pregnant or breastfeeding should avoid its use. The exact AHPA Botanical Safety Handbook class was not confirmed in this pass (see needs_review); on the available modern data the prudent, consumer-safe verdict is to avoid.
Avoid during lactation. There is no reliable data on whether Hydrangea's constituents pass into breast milk, and the same cyanogenic-glycoside and emetic-alkaloid concerns apply. Southern Cross University groups lactation with pregnancy in advising avoidance for the lack of pharmacological and toxicity data, and Healthline advises breastfeeding women to avoid the root. Insufficient data; avoid.
No established pediatric dosing, and not recommended for self-directed use in children. Given the cyanogenic glycoside, emetic alkaloids, and overdose potential (dizziness, chest oppression, and central-nervous-system and gastrointestinal upset), reserve any pediatric use to a qualified practitioner, and refer children with stones, urinary obstruction, or urinary infection for medical evaluation rather than treating at home. Insufficient data; avoid without professional guidance.
Hydrangea root is generally well tolerated in ordinary doses, but it is not a casual, high-dose herb. King's American Dispensatory warned that in overdose it produces dizziness of the head and a sense of oppression or constriction of the chest; modern monographs add gastroenteritis, nausea, vomiting, and disturbance of the central nervous system at higher doses, so keep to the low, specific-medication doses and do not exceed them. The root contains a cyanogenic glycoside (hydrangin) and the emetic quinazoline alkaloids febrifugine and isofebrifugine, giving it a real, if small, potential for toxicity; it should not be taken freely or long-term without guidance. As a diuretic it increases urine output, so prolonged use can lower blood pressure and deplete electrolytes; monitor this, especially in older people and those on other diuretics. The fresh plant and its dust can provoke contact dermatitis through the allergen hydrangenol. It does not dissolve large, established stones, and must never delay urological evaluation of significant stone disease, obstruction, or a hard, enlarging prostate.
Pregnancy and lactation (insufficient safety data, plus a cyanogenic glycoside and emetic alkaloids: avoid). Known allergy or hypersensitivity to Hydrangea. Large or obstructing urinary stones, urinary obstruction or retention, and significant kidney disease, which need medical and urological management rather than self-treatment. Marked dryness, fluid depletion, and cold-deficient, exhausted states, which its cooling, drying, draining character aggravates. Avoid high or prolonged dosing and casual self-dosing, given the overdose picture (dizziness, chest oppression, and central-nervous-system and gastrointestinal disturbance).
Hydrangea arborescens is a common, widely distributed native shrub of eastern North American woodlands, and is also very widely cultivated in gardens (for example the cultivar 'Annabelle'); it is not listed as at-risk or endangered by United Plant Savers. The real stewardship concern is the method of harvest: digging the root kills the plant, so wild harvest should be limited to abundant stands, taken thoughtfully, and never from fragile stream banks where root removal worsens erosion (a caution stressed by field herbalists). Cultivated or responsibly wildcrafted root is preferable.
Not found in the canonical biblical texts nor in the classical Greco-Roman herbals of Dioscorides and Pliny; Hydrangea arborescens is native to eastern North America and was unknown to the ancient Mediterranean world. Its medicinal tradition is Native American (the Cherokee and other eastern woodland peoples used the root for stone and urinary complaints) and, from that root, nineteenth-century Eclectic and Physiomedical American herbalism. Cited honestly as a herb of North American, not biblical, tradition.
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