Overview
Rhubarb (Rheum rhabarbarum) is a hardy perennial plant native to Asia and Europe, cultivated for its thick, edible stalks and medicinal roots. While the stalks are prized for their tart flavor in pies and preserves, the roots have been used in traditional Chinese and Ayurvedic medicine for centuries. Botanically, rhubarb belongs to the Polygonaceae family, alongside buckwheat and sorrel. The plant thrives in temperate climates and is harvested in spring or early summer. Notably, only the stalks are edible; the leaves contain toxic levels of oxalic acid and should never be consumed.
Key Features
Rhubarb stalks are characterized by their bright red or green color, fibrous texture, and sharp acidity due to malic and citric acids. The roots contain anthraquinone glycosides, such as emodin and rhein, which contribute to their laxative and anti-inflammatory effects. Culinary varieties are bred for tender stalks with balanced sweetness, while medicinal-grade rhubarb focuses on root potency. The plant’s large, heart-shaped leaves serve as a visual identifier but must be discarded during processing due to toxicity.
Application Areas
In the food industry, rhubarb stalks are cooked with sugar to mitigate tartness and used in desserts, compotes, and beverages. Its natural pectin content makes it ideal for jams. The food sector accounts for over 70% of global rhubarb production. Medicinally, dried rhubarb root is employed in herbal formulations for constipation relief and digestive support. Emerging research explores its potential antimicrobial and anticancer properties, though clinical evidence remains limited. Industrial applications include natural dye extraction from roots.
Precautions
Rhubarb leaves contain approximately 0.5% oxalic acid, which can cause kidney damage or poisoning if ingested. Commercial processors must adhere to strict leaf-removal protocols. Medicinal root use requires caution: prolonged consumption may lead to electrolyte imbalance or dependency for bowel function. B2B buyers should verify lab reports for heavy metals and microbial contamination, especially for roots sourced from traditional markets. Proper drying and storage (below 15% moisture) prevent mold growth in root products.
B2B Procurement Guide
For culinary stalks, prioritize suppliers with cold-chain logistics to preserve freshness. Major producing regions include the UK, Netherlands, and the US Pacific Northwest. Seasonal availability (April–June) may necessitate frozen or canned alternatives for year-round supply. Medicinal root buyers should seek GMP-certified processors. Pricing for dried root slices ranges from $15-$50/kg depending on purity and bioactive compound levels. Contracts often specify emodin content (typically 1–3%) for consistency in herbal formulations.
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