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Brassica oleracea var. viridis
Collard greens, botanically classified as Brassica oleracea var. viridis, are broad-leaved vegetables belonging to the mustard family, Brassicaceae. They are members of the same species as cabbage, kale, broccoli, cauliflower, and Brussels sprouts, but collards grow as an open rosette rather than forming a compact head. Their large, sturdy leaves are usually blue-green or deep green, with prominent pale ribs and a slightly waxy surface. Raw collards taste earthy, vegetal, and mildly bitter, while slow cooking softens their fibers and develops a sweeter, richer flavor. Both the leaves and tender stalks are edible, although thick stems often need additional cooking time. Collard greens are deeply associated with the cuisines of the southern United States, where they are traditionally simmered with aromatics and smoked meat, but they also appear in Brazilian, Portuguese, East African, Indian, and Mediterranean cooking. Nutritionally, raw collards provide abundant vitamin K, vitamin C, folate, provitamin A carotenoids, calcium, manganese, fiber, and vitamin E. They also contain glucosinolates, carotenoids, flavonoids, and other phytonutrients. Their cold tolerance, productive leaves, and ability to withstand repeated harvesting make collards a valuable garden and agricultural crop.
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Per 100g
Per 100g
Nutrition breakdown for one serving
The eastern Mediterranean and parts of western Europe, where non-heading forms of Brassica oleracea developed
Collard greens descend from ancient non-heading forms of wild cabbage cultivated around the Mediterranean for thousands of years. Greeks and Romans grew leafy brassicas that resembled modern kale and collards. These hardy vegetables spread throughout Europe and later traveled to Africa and the Americas through migration, colonization, agriculture, and trade. In the southern United States, collards became deeply connected with African American food traditions, drawing upon African knowledge of cooking leafy greens as well as available European brassica crops. Collards also became important in Brazilian and Portuguese dishes and in several East and southern African cuisines. Modern cultivars have been selected for cold tolerance, heat tolerance, leaf size, texture, flavor, and resistance to bolting and disease.
Collard greens are cool-season vegetables that can be grown through autumn, winter, and spring in mild climates. Regional cultivation makes them available throughout much of the year.
Each variety offers unique flavors, textures, and culinary applications
Keep your fruit fresh and delicious for longer
Choose collard greens with firm, crisp leaves and an even green or blue-green color appropriate to the variety.
Look for leaves without extensive yellowing, brown edges, holes, slime, mold, or signs of decay.
Select smaller leaves for quicker cooking and a more tender texture; larger mature leaves are well suited to braising.
Check that the stems are firm and moist rather than dry, split, or rubbery.
Avoid bunches with sour odors or excessive moisture trapped inside the packaging.
Refrigerate unwashed collard greens at 4°C or below in a perforated bag or ventilated container.
Wrap the bunch loosely in a clean, slightly damp towel if necessary to reduce moisture loss and wilting.
If the leaves have been washed, dry them thoroughly before refrigeration to limit deterioration.
Keep collards separate from raw meat, poultry, seafood, and their juices.
Remove slimy, moldy, or decaying leaves promptly so spoilage does not spread.
Separate the leaves and rinse them thoroughly under cool running water, rubbing away soil from both sides.
Remove the thick central rib by folding each leaf and cutting or tearing along the stem.
Slice stacked leaves into ribbons for sautéing, soups, braises, or stir-fries.
Begin cooking chopped stems before the leaves if retaining tender portions of the ribs.
Massage finely sliced young collards with a little dressing when serving them raw to soften their texture.
For less bitterness, blanch the leaves briefly or cook them with acidic, sweet, or aromatic ingredients.
Do not use soap, detergent, bleach, or household disinfectants to wash collard greens.
Preserve freshness for months
Wash collard leaves thoroughly and remove very thick, fibrous stems before freezing.
Blanch prepared leaves in boiling water for approximately 3 minutes, using slightly less time for very tender young leaves.
Cool the blanched greens immediately in ice water to stop cooking and preserve color.
Drain thoroughly, press out excess moisture, portion into airtight containers or freezer bags, and label with the date.
Use frozen collards in soups, stews, braises, curries, and other cooked dishes.
Label frozen items with the date to track freshness. Most fruits maintain quality for 2-3 months when properly frozen. For best results, use airtight containers or freezer bags to prevent freezer burn.
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Allergy to collard greens is uncommon but possible. Reactions may involve oral itching, hives, swelling, digestive symptoms, respiratory symptoms, or, rarely, anaphylaxis. People allergic to mustard-family vegetables may require professional evaluation because cross-reactivity is possible. Severe symptoms such as throat swelling, breathing difficulty, faintness, or widespread hives require urgent medical attention.
Pesticide use and measured residues vary by country, farm, season, and growing system. Separate the leaves and rinse them thoroughly under running water, paying attention to the undersides and central ribs where soil can collect. Washing may reduce dirt, microorganisms, and some surface residues but cannot remove every residue. Organic collards should also be washed because organic production does not eliminate microbial contamination.
Surprising trivia you'll love!
Collard greens belong to the same species as cabbage, broccoli, cauliflower, kale, and Brussels sprouts.
Unlike cabbage, collards grow as an open cluster of leaves rather than forming a tight head.
Cool weather and light frost can make collard leaves taste sweeter.
The cooking broth from traditional collard greens is commonly called pot liquor or potlikker.
Collards can be harvested repeatedly by removing the mature outer leaves while leaving the center to continue growing.
Collard greens are important in Southern American, Brazilian, Portuguese, and several African culinary traditions.
Brazilian couve à mineira is typically prepared by slicing collards into very thin ribbons and quickly sautéing them.
Some collard cultivars develop blue-green leaves because of a natural waxy coating.
Collards and kale are closely related but are not identical culinary groups. Both belong to Brassica oleracea and generally remain open-leaved rather than forming tight heads. Collards typically produce broad, smooth, sturdy leaves with prominent ribs, while many kale cultivars have curled, frilled, or deeply textured foliage. Collards often retain their structure during long cooking and have a robust, earthy flavor. Kale varies from tender and mild to peppery or strongly vegetal. They can substitute for one another in many soups, sautés, braises, and stews, although cooking time may differ.
Plain collard greens are nutrient-dense and relatively low in calories. Raw collards provide vitamin K, vitamin C, folate, provitamin A carotenoids, calcium, manganese, vitamin E, fiber, and smaller amounts of several other nutrients. Their final nutritional profile depends on preparation. Long cooking can reduce vitamin C and some B vitamins, while smoked meats, salty broth, and added salt can greatly increase sodium. Preparing collards with beans, tomatoes, aromatics, olive oil, herbs, and moderate seasoning can produce a balanced dish without relying on large quantities of processed meat.
Separate the leaves and inspect them for damaged areas, insects, and soil. Rinse each leaf thoroughly under cool running water while gently rubbing both surfaces. Do not use soap, detergent, or household disinfectant. To remove a thick central rib, fold the leaf lengthwise and cut or tear along both sides of the stem. Stack the leaf halves, roll them loosely, and slice them into ribbons. Tender portions of the stalk can be chopped and cooked first. Dry leaves intended for sautéing so excess water does not interfere with browning.
Exposure to cool conditions can alter carbohydrate metabolism in collard plants. The leaves may accumulate more soluble sugars and related compounds that help protect plant cells from cold stress. This increased sweetness can make their natural bitterness seem less pronounced. Genetics, maturity, weather, growing conditions, and storage also influence flavor, so frost does not produce exactly the same result in every crop. Cooking further softens bitterness by breaking down tissues and dispersing some flavor compounds, especially when the greens are paired with vinegar, lemon, onions, garlic, or a small amount of sweetness.
Cooking time depends on leaf age, cutting size, method, and the desired texture. Thinly sliced young collards may become tender after 5 to 10 minutes of sautéing or steaming. Mature leaves intended for a traditional braise may need 30 to 60 minutes or longer at a gentle simmer. Pressure cooking can shorten the process considerably. The greens are ready when the leaves and retained stems reach the preferred tenderness without developing an unpleasantly mushy texture. Shorter cooking generally preserves more vitamin C, while longer cooking creates a softer, deeper-flavored dish.
Collard greens contain approximately 364% of the Daily Value for vitamin K per 100 g. Vitamin K can influence the action of warfarin and other vitamin K antagonist medicines. People taking these drugs generally should not eliminate nutritious leafy vegetables automatically. Instead, clinicians commonly recommend keeping vitamin K intake reasonably consistent so the medication dose can be managed appropriately. Sudden large increases or decreases may alter anticoagulation. Anyone taking an anticoagulant should follow individualized advice from the prescribing clinician or registered dietitian and should not independently change medication.
Collards are a useful plant source of calcium and are relatively low in oxalate compared with spinach. Oxalate binds calcium in the digestive tract, so lower-oxalate greens generally provide more absorbable calcium than high-oxalate vegetables containing a similar measured amount. Absorption still varies with the meal and the individual's nutritional status. Collards can contribute to calcium intake, but a small serving may not satisfy daily requirements by itself. A balanced diet may also include fortified foods, dairy products, calcium-set tofu, beans, or other appropriate sources.
Pot liquor, also written potlikker, is the flavorful cooking liquid remaining after collard greens or similar leafy vegetables have been simmered. It contains water, seasonings, dissolved plant compounds, and some nutrients that leach from the leaves during cooking. In Southern food traditions, it may be served with cornbread or used as a broth. Its nutritional composition depends heavily on the recipe. Pot liquor made with smoked or cured meat, salty stock, and added salt can contain substantial sodium, so portion size and seasoning should be considered.
Sustainability insights
Collard plants can provide repeated harvests over a long growing period, potentially improving yield per planting. Their environmental impact depends on fertilizer, irrigation, pesticide use, soil management, refrigeration, packaging, transportation, and food waste. Crop rotation, integrated pest management, efficient nutrient application, compost use, erosion control, and seasonal production can improve sustainability.
No single carbon-footprint value represents all collard production. Seasonal field-grown collards generally require less energy than greens produced in heated structures or transported by air. Fertilizer manufacture, farm machinery, cooling, packaging, transport, cooking time, and discarded food all contribute to emissions. Using tender stems and leftovers safely can reduce waste.
Collards require sufficient moisture for productive, tender leaves, but water use varies with climate, soil, yield, and irrigation method. Drip irrigation, mulching, soil-moisture monitoring, rainfall-based scheduling, and healthy soil organic matter can reduce unnecessary water consumption.
Locally grown seasonal collards may reduce transport and long-term refrigeration while reaching consumers in fresher condition. Distance alone does not determine total impact, since farming efficiency, fertilizer use, irrigation source, packaging, storage, transport mode, cooking practices, and waste also matter. Purchasing appropriate quantities and using both leaves and tender stems can improve resource efficiency.
We aim to keep this Collard Greens profile accurate and easy to understand. Nutrition values and % Daily Value figures are based on established reference databases and standard daily value guidance.
Last updated: August 26, 2026
Medical disclaimer
This page is for general educational purposes and does not replace professional medical advice.
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