Despite their occasional visual similarities and crunchy stalks, rhubarb and celery are not botanically related. They belong to entirely different plant families, meaning their evolutionary paths, genetic makeup, and core characteristics are distinct.
This common misconception often arises because both plants feature prominent, elongated stalks that are used culinarily. However, understanding their true botanical classifications, nutritional compositions, and traditional uses reveals just how unique each of these garden favorites truly is. We’ll explore what sets them apart, from their scientific families to their roles on our plates, ensuring you can confidently distinguish between these two intriguing vegetables.
Understanding Their Botanical Roots: Separate Families, Separate Paths
The easiest way to determine if plants are related is to look at their botanical classification. This scientific system groups organisms based on shared evolutionary ancestry and genetic characteristics. For rhubarb and celery, their family names immediately tell the story.
Celery: A Member of the Apiaceae Family
Celery, scientifically known as Apium graveolens, is a proud member of the Apiaceae family. This large and diverse family, also referred to as the Umbelliferae, is commonly known as the carrot, parsley, or celery family. It encompasses over 3,800 species across approximately 446 genera. Other well-known plants in this family include carrots, parsley, dill, fennel, and cilantro. Members of the Apiaceae family typically feature hollow stems, feathery leaves, and characteristic umbrella-shaped flower clusters called umbels.
The name Apium, from which Apiaceae is derived, was used by Pliny the Elder around 50 AD for a celery-like plant. Celery itself has been cultivated as a vegetable since ancient times.
Rhubarb: Rooted in the Polygonaceae Family
In stark contrast, rhubarb, with the scientific name Rheum rhabarbarum (though often referred to as Rheum x hybridum or Rheum x cultorum due to hybridization), belongs to the Polygonaceae family. This family is commonly known as the buckwheat family. Other relatives include buckwheat, sorrel, and knotweed. Rhubarb is a hardy perennial, meaning it regrows each year from its rootstock. Its ancestry traces back to the cold climates of China, Mongolia, and Siberia, where it was used medicinally over 5,000 years ago.
The distinction in families highlights a fundamental difference in their biological structures and growth patterns, even if their stalks share a superficial resemblance.
Key Differences Beyond Family Ties
While their botanical classifications are the definitive answer, observing their physical characteristics, growth habits, and internal compositions further emphasizes their independent nature.
Visual and Structural Differences
At a glance, the stalks of rhubarb and celery can indeed appear somewhat similar, leading to confusion. Both are long and fibrous. However, closer inspection reveals noticeable differences.
- Color: Celery stalks are typically light to dark green. Rhubarb stalks, on the other hand, can range from pale green to striking red or pink, often with streaks of these colors. The red color in rhubarb comes from anthocyanin, a type of flavonoid.
- Texture: Celery stalks are crisp and juicy, maintaining a firm texture whether raw or cooked. Rhubarb stalks are also crisp, but they tend to soften considerably when cooked, sometimes becoming stringy.
- Leaves: This is a critical difference. Celery leaves are edible and often used as an herb or garnish. Rhubarb leaves, however, are toxic due to high concentrations of oxalic acid and should never be consumed. Only the stalks (petioles) of rhubarb are edible.
- Root System: Celery is typically a biennial plant grown as an annual, with a relatively small root system focused on stalk production. Rhubarb is a robust perennial, growing from a substantial crown and root system that allows it to return year after year.
Nutritional Profiles: Distinctive Compositions
Their separate botanical origins result in distinct nutritional offerings. Both are low in calories and good sources of certain vitamins and minerals, but their unique compounds contribute to different health benefits.
Rhubarb’s Nutritional Highlights
Rhubarb is known for being high in fiber and low in calories. It contains several phytonutrients with health-promoting properties, including anthocyanins, which are antioxidants. Rhubarb also provides vitamin K, vitamin C, calcium, and potassium. The oxalic acid, while toxic in the leaves, is present in smaller, safe amounts in the stalks and can bind with calcium, potentially reducing its absorption, though this is generally not a concern in a balanced diet.
Celery’s Nutritional Highlights
Celery is primarily composed of water, making it a very low-calorie food. It is an excellent source of vitamin K, vitamin C, vitamin A, folate, and potassium. Celery also contains unique compounds like phthalides, which have been studied for their potential health benefits, and antioxidants such as luteolin and apigenin.
Here’s a simplified comparison of their general nutritional aspects:
| Feature | Celery (Apium graveolens) | Rhubarb (Rheum rhabarbarum) |
|---|---|---|
| Plant Family | Apiaceae (Carrot/Parsley family) | Polygonaceae (Buckwheat family) |
| Edible Parts | Stalks, leaves, seeds, root (celeriac) | Stalks (petioles) only; leaves are toxic |
| Typical Flavor | Mild, slightly earthy, subtly peppery | Very tart, sour (often sweetened for culinary use) |
| Common Colors | Light to dark green | Green, pink, red, or variegated |
| Texture Raw | Crisp, juicy, fibrous | Crisp, fibrous, somewhat stringy |
| Texture Cooked | Retains some crispness | Softens significantly, can become mushy |
| Key Nutrients | Vitamin K, C, A, folate, potassium | Vitamin K, C, calcium, fiber, anthocyanins |
Culinary Applications and Flavor Profiles
The most telling difference for many home cooks lies in how these two “stalky” vegetables are used in the kitchen. Their distinct flavor profiles guide their culinary destinies.
Celery’s Savory Versatility
Celery is a workhorse in savory cooking. Its mild, slightly peppery, and earthy flavor makes it a fundamental aromatic in many cuisines. It is a cornerstone of mirepoix (a French aromatic base of diced carrots, celery, and onions) and the “holy trinity” in Cajun/Creole cooking (celery, onions, and bell peppers).
- Raw: Enjoyed as a crunchy snack, often with dips, or in salads for texture and a refreshing bite.
- Cooked: Essential in soups, stews, casseroles, stuffings, and sauces, where it adds a subtle background flavor and tender texture.
- Seeds: Celery seeds are used as a seasoning, particularly in pickles and savory dishes.
“Celery is prized for its crisp texture and subtle, savory notes, making it an indispensable ingredient for building flavor foundations in countless dishes,” notes Chef Maria Sanchez, a culinary instructor based in New York. “It provides structure and a fresh counterpoint without overpowering other ingredients.”
Rhubarb’s Tart Charm
Rhubarb is almost exclusively used in sweet preparations due to its intensely tart flavor. It’s so tart, in fact, that it’s nearly always paired with a generous amount of sugar or sweeter fruits like strawberries to balance its acidity. This tartness is one of its most defining characteristics.
- Desserts: Famous for pies, crumbles, tarts, and cobblers, often combined with strawberries.
- Sauces and Jams: Cooked down into compotes, sauces, and jams, perfect for topping yogurt, ice cream, or pancakes.
- Beverages: Used in shrubs, cocktails, and refreshing non-alcoholic drinks.
Though legally classified as a fruit in the United States since a 1947 court ruling, botanically, rhubarb is a vegetable. This classification primarily arose for tariff and trade reasons, as fruits generally had lower import duties. “Its usage firmly places it in the fruit category for most consumers,” explains Juliet Glass, director of communications at FRESHFARM, a non-profit operating farmers’ markets.
Historical Context and Cultivation
Their histories also diverge, reflecting their distinct origins and paths to culinary prominence.
The Ancient History of Celery
Celery’s origins trace back to the Mediterranean region. Wild celery, or smallage, was used medicinally by ancient civilizations long before its stalks became a common food item. The bitterness of wild celery was a significant barrier to its widespread culinary use. Over centuries, selective breeding focused on reducing this bitterness and increasing its sugar content, leading to the cultivated varieties we enjoy today.
Celery is a cool-season biennial plant typically grown as an annual in the US. It prefers rich, moist soil and consistent watering. Commercial production in the US sees significant crops in California and Florida.
Rhubarb’s Asian Roots
Rhubarb has a long and storied history, primarily as a medicinal plant, originating in Asia over 5,000 years ago. It was highly valued in traditional Chinese medicine. Its journey to Europe was often intertwined with the tea trade, where it was prized for its purported digestive properties.
It wasn’t until the 17th century that rhubarb began to be consumed culinarily in England, initially with some confusion regarding its toxic leaves. Rhubarb thrives in cooler climates, requiring cold temperatures to produce its characteristic stalks. Washington, Oregon, and Michigan are among the top US producers.
Common Misconceptions and Why They Occur
The visual similarity between rhubarb and celery stalks is undoubtedly the primary reason for confusion. Both are long, somewhat rigid, and can be green. However, as we’ve explored, this resemblance is purely superficial.
One expert, Debra Moser, co-founder of Central Farm Markets in Washington D.C.,
succinctly states, “They look like celery, but instead of that bright green color, rhubarb usually comes in shades of red, pink, white, and a muted green. They’re not related to celery at all, but are actually in the buckwheat family.”
Another factor might be the shared “vegetable” categorization. Although rhubarb is often used like a fruit, botanically it is a vegetable, just like celery. This shared, broad classification can inadvertently reinforce the idea of a closer relationship than actually exists.
Health Benefits: Unique Contributions to Wellness
Both rhubarb and celery offer distinct health benefits, stemming from their unique nutritional compounds.
Benefits of Rhubarb
- Rich in Antioxidants: The vibrant red color of some rhubarb stalks indicates the presence of anthocyanins, powerful antioxidants that may help protect cells from damage and have been linked to cancer protective properties.
- Digestive Health: Rhubarb is an excellent source of dietary fiber, which is crucial for maintaining a healthy digestive system, preventing constipation, and promoting regularity.
- Bone Health: It provides vitamin K, which plays a role in bone metabolism and blood clotting, and calcium.
- Heart Health: Phytochemicals in rhubarb have been reported to help prevent cardiovascular disease.
Benefits of Celery
- Hydration: With its high water content, celery contributes significantly to hydration, which is vital for all bodily functions.
- Anti-inflammatory Properties: Celery contains antioxidants and polysaccharides that are known to act as anti-inflammatories, potentially helping to reduce inflammation in the body.
- Blood Pressure Regulation: Compounds called phthalides in celery may help relax the muscles around arteries, contributing to healthier blood pressure levels.
- Vitamin K Powerhouse: Celery is particularly rich in vitamin K, important for blood clotting and bone health.
Frequently Asked Questions About Rhubarb and Celery
Are rhubarb and celery interchangeable in recipes?
No, rhubarb and celery are not interchangeable in recipes due to their vastly different flavor profiles. Celery offers a mild, savory taste, while rhubarb is intensely tart and typically used in sweet dishes. Substituting one for the other would drastically alter the intended flavor of a dish.
Are the leaves of rhubarb and celery both edible?
The leaves of celery are edible and can be used in cooking. However, rhubarb leaves are toxic and should never be consumed because they contain high levels of oxalic acid.
Why do people often mistake rhubarb for celery?
People often confuse rhubarb and celery because their stalks share a superficial visual resemblance, being long and fibrous. Despite this, their botanical classifications, flavors, and culinary uses are entirely distinct.
Is rhubarb a fruit or a vegetable?
Botanically, rhubarb is classified as a vegetable. However, in the United States, it was legally reclassified as a fruit in 1947 for trade and tariff purposes, leading to its common culinary use in sweet dishes like pies and jams.
Conclusion: Two Distinct, Delicious Vegetables
In conclusion, while rhubarb and celery might share a superficial resemblance in their stalky appearance, they are fundamentally distinct plants. They belong to different botanical families—celery to the Apiaceae (carrot family) and rhubarb to the Polygonaceae (buckwheat family). This separation dictates everything from their genetic makeup and growth habits to their nutritional profiles and, most notably, their culinary applications. Celery lends its mild, savory crunch to a myriad of savory dishes, while rhubarb’s intense tartness makes it a star in sweet desserts. Understanding these differences not only clarifies a common misconception but also enhances our appreciation for the diverse and unique contributions each plant brings to our gardens and our tables.
Disclaimer: The information provided in this article is for general knowledge and informational purposes only, and does not constitute medical advice. Always consult with a qualified healthcare professional before making any decisions about your health or treatment. Consuming rhubarb leaves can be harmful due to their high oxalic acid content; only the stalks should be eaten.
