Archaeologists working at Border Cave in the Lebombo Mountains of South Africa pulled 55 charred whole rhizomes out of old fireplaces. They belong to a plant called Hypoxis, the yellow star flower, and they are up to 170,000 years old.
Somebody dug those up with a stick, carried them back to the cave, and roasted them in the ashes rather than eating them where they found them. Which means they were sharing.
That’s the oldest direct evidence anyone has of humans cooking something that grows underground, and it beats farming by roughly 160,000 years. Roots fed us first.
Most of the things on the list below are not roots.
What is a root vegetable?
A root vegetable is any vegetable grown for the fattened part it stores energy in underground. That’s a kitchen definition, not a botanical one, and the difference is the whole trick.
Plants build storage organs out of whatever part is handy. A carrot fattens its main root. A sweet potato fattens a side root. A potato fattens an underground stem, and ginger fattens one that creeps sideways. An onion is a stack of leaf bases wrapped around a bud.
Same bin at the store. Five different parts of a plant.
That matters more than it sounds like it should, because the organ tells you what you’re getting. Stems and roots built for winter survival are packed with starch. Leaves stacked into a bulb are not. It’s why a potato and an onion behave nothing alike in a pot, and why the list below is sorted the way it is.
The 20 root vegetables
All twenty, grouped by the part of the plant you’re actually putting in the pot.
Taproots
The plant’s main root, swollen into a pantry. These are the ones that actually deserve the name.
Carrot. Deep orange from beta-carotene, which your body turns into vitamin A. Raw, roasted, or grated into everything.
Beet. Earthy and sweet, and the red comes from betalain pigments rather than the carotenoids in orange roots. Greens are edible and better than the ones you buy in a bag.
Turnip. Sharp when raw, mellow when roasted. The purple shoulder is where the sun hit it.
Rutabaga. A turnip crossed with a cabbage a few centuries ago, bigger and denser than either. Mash it with butter.
Parsnip. Looks like a pale carrot and tastes like nothing until the weather turns. Cold is not optional with this one.
Radish. Fast, peppery, and ready in a month. Daikon is the same plant grown long and mild.
Celeriac. The knobby, dirt-caked ball that scares people at the market. Under that skin it’s smooth and nutty, and it makes the best mash on this list!
Horseradish. A root you grate rather than eat, and one plant will supply a neighborhood for a decade whether you want it to or not.
Tuberous roots
Side roots that swell into storage instead of the main one.
Sweet potato. Orange varieties carry serious beta-carotene, purple ones carry anthocyanin pigments, and white ones carry neither. The name on the bin does not tell you which.
Cassava. The main food source for roughly 600 million people, and the one item here that has to be processed before you eat it. Raw cassava carries cyanogenic compounds. In a 2017 outbreak in Kasese District, Uganda, 98 people fell ill and two died after eating flour that tested at eight times the safe cyanide level. Peel it, soak it, cook it through.
Jicama. Crisp, faintly sweet, and holds its crunch in a way almost nothing else underground does. Eat it raw with lime and chili.
Stem tubers
Not roots at all. Swollen underground stems, which is why they grow eyes.
Potato. Potassium, vitamin C, and B vitamins, with more of the good stuff concentrated near the skin. But did you really need me to tell you how to enjoy a potato?
Yam. Not a sweet potato, despite what the grocery store label says. True yams are a different genus entirely, drier and starchier, and you’ll find a real one at an African or Caribbean market rather than a supermarket.
Jerusalem artichoke. Also sold as a sunchoke, and neither from Jerusalem nor an artichoke. It’s a sunflower, and the tubers are loaded with inulin, a fiber your gut bacteria digest instead of you. Start small and you’ll find out why.
Rhizomes and corms
Stems again, running sideways or standing upright underground.
Ginger. The heat comes from gingerol, a phenolic compound. Grate it into anything, and don’t bother peeling it if it’s fresh.
Turmeric. Same family as ginger, and the yellow is curcumin. Fresh turmeric is a different food from the powder and worth hunting down once.
Taro. A corm, not a tuber, and another one that needs cooking before it’s edible. Nutty, purple-flecked, and the base of poi.
Bulbs
Leaves, stacked and swollen around a bud. The vegetables nobody thinks of as root vegetables.
Onion. Quercetin and organosulfur compounds, plus the base note under about half the food you cook.
Garlic. Allicin forms when you crush it, not before, so let chopped garlic sit a few minutes before it hits heat. A 2002 review of garlic and cardiovascular disorders found modest effects on cholesterol and blood pressure across a pile of small trials.
Shallot. Onion flavor with a sweeter finish and less bite. Worth the extra dollar when a sauce depends on it.
Which vegetables are not root vegetables?
Anything the plant grows above the soil line, no matter how the produce section shelves it.
Broccoli and cauliflower are flower buds. Zucchini is a fruit. Kohlrabi is a swollen stem sitting on top of the ground. Fennel’s bulb is a cluster of leaf bases at ground level rather than under it, which is why you’ll find it on some lists and not others.
Ginseng is a genuine root that nobody puts in a stew, so the edges are fuzzy at both ends. That’s what happens when a kitchen word gets asked to do botany.
Are root vegetables good for you?
Yes, and the case is stronger than the usual vegetable pitch.
They run 16 to 81 calories per 100 grams with 1.6 to 7.3 grams of fiber, which is a lot of food for very little energy. The pigments doing the coloring are the same compounds doing the work, and polyphenols like the ones in beets and onions have real anti-inflammatory activity in the lab and in animals.
The gut argument is the most interesting one. Roots and tubers are a serious source of prebiotic fiber, meaning starch and inulin that your own enzymes can’t touch, so they arrive in the colon intact and feed the bacteria living there.
Beets get the loudest health claims, and they’re worth a closer look because the evidence is narrower than the headlines. In a randomized, double-blind crossover trial, twelve trained men drank beetroot juice or a placebo before a CrossFit workout. They did more reps, but only in the round where they got a three-minute rest, and they finished the session more fatigued than on placebo, not less. Twelve men, one workout. A promising signal, and a small one.
What root vegetables take up from the soil
A leaf spends its life in the air. A tomato hangs off a vine. A carrot spends every day of its existence inside the dirt, which means it is made of that dirt.
A 2022 review of what root vegetables actually absorb from soil lists lead and cadmium, pesticide residues, pharmaceutical residues, microplastics, and nitrates. The same review concludes that the levels typically found don’t pose a health risk to the average person eating them.
So this isn’t a scare. It’s a fact about the category. The ground is an ingredient, and it’s the one ingredient nothing on the package reports.
Organic certification tells you what wasn’t sprayed during the growing season. It doesn’t tell you what an orchard, a mill, a highway, or a lead smelter left in that field forty years earlier, because it was never built to. A process standard is not a soil test, and a bag of carrots has no address on it.
That’s not because the farmer is hiding something. Almost none of them are, and the grower who knows his ground is usually delighted to talk about it. It’s because the supply chain that moves a carrot across a continent doesn’t carry that information, and nobody has ever asked it to.
Which hands you a question worth carrying around: what was on this ground before? You can ask it at any farmers market in the country and get an answer in ten seconds. And metals concentrate in the skin more than the flesh, so where you can’t trace the ground, peel it. That costs you some nutrition, since the skin holds more of the good things too, and it’s the honest trade.
Why do people avoid root vegetables?
Carbohydrates, mostly, and the objection isn’t stupid.
A cup of sweet potato carries several times the carbohydrate of a cup of radishes. Roots are the vegetables that store energy for a living, so that’s the entire point of them, and if you’re managing blood sugar the gap is worth knowing.
But it’s a range to work inside, not a category to throw out. Radishes, turnips, jicama, and celeriac sit at the low end. Potatoes, parsnips, and sweet potatoes sit at the high one. Most people are not diabetic and never need to run this math at all.
How to buy and store root vegetables
Buy them after the first hard frosts. Cold makes roots sweeter, and it isn’t folklore. When field temperatures dropped below 5 degrees Celsius for twelve days before harvest, parsnips converted starch into sugar measurably. In a warmer year, the same variety didn’t change at all. The carrots I’ve pulled in July get big and taste like nothing.
Ask one grower one question. What was on this ground before you got here? It’s free, it takes a minute, and the answer tells you more than any seal on a bag.
Buy the ugly ones. Celeriac, rutabaga, and sunchokes are cheap precisely because they look like something you’d dig out of a drain. They’re the best value on the table.
Store them cold, dark, and separate. Potatoes and onions in a dark cupboard around 55 degrees Fahrenheit, everything else in the crisper. Keep the two apart, because onions push potatoes to sprout.
Grow a few. Roots are forgiving crops, and they want cool soil. Beets were the first vegetable I grew that I was proud of, and nothing beats handing a kid a potato they just dug up.
Most of these are sitting in your grocery store right now, and most carts leave with the same handful. Go get the knobby one you’ve been walking past.
Then ask the person who grew it what the ground used to be. See you at the farmers market this Saturday.
