Educational information, not medical advice — ask your doctor or midwife.
What is crow garlic? Crow garlic is a wild cousin of the onion, known to botanists as Allium vineale.
It grows as a slim, grassy clump in fields, lawns and vineyards across Europe. German speakers call it Weinberg-Lauch, the vineyard leek.
The hollow leaves and the small underground bulbs smell strongly of garlic. Foragers chop them into soups, salads, butter and pesto. Farmers treat the same plant as a weed, because grazing cows pass the taste into their milk.
Here is the honest verdict. No human trials back any health claim for crow garlic. Long folk use tells you people valued it, but it is not proof that it works, and it is not proof that it is safe.
The main real-world risk is not the plant itself. It is picking the wrong plant. Several toxic lookalikes share the same grassy shape in the same fields.
How is it thought to work? The short answer is that nobody has shown how it works in people, because it has not been tested in them.
Like other onions, crow garlic makes sulfur compounds when the tissue is crushed. In test tubes, extracts of Allium vineale slow the growth of some bacteria and fungi. Laboratory work also reports antioxidant activity, meaning the extract mops up reactive molecules in a dish.
Whether any of that happens in your body after a meal is unknown. A dish of chopped leaves is a very different thing from a concentrated extract on a lab bench.
Folk thinking simply treated the plant as garlic by another name. Garlic itself has some human research behind it for blood fats and blood pressure, with modest and mixed results. Those findings belong to Allium sativum and cannot be transferred to this plant.
How is it used? Almost always as a fresh food, gathered by hand.
Common forms:
- Fresh green leaves, chopped like chives. - Small bulbs and bulbils (tiny bulbs that form in the flower head), used like garlic cloves.
- Herb vinegars, flavoured oils, butters and pestos. - Dried leaf, which loses much of the smell and taste.
You will rarely see it sold. It is not a mainstream supplement, and there is no capsule, tablet or standard tincture on normal shop shelves. Most people who use it pick it themselves.
Homemade garlic oils carry a real food-safety risk. Oil kept at room temperature with fresh plant matter in it can grow the bacteria that cause botulism, a rare but severe illness.
What did tradition claim? European country people treated crow garlic as poor man's garlic and used it in much the same way.
Written herbals and folk records describe it being eaten for winter coughs and colds. It was also given for worms, for sluggish digestion and as a spring tonic after a lean winter. Crushed leaves were sometimes laid on bites, stings and small wounds.
Its other historical role was less flattering. Agricultural writings from Germany, Britain and North America treat it mainly as a stubborn vineyard and pasture weed. Dairy farmers complained that it tainted milk and butter.
None of this was tested. These records describe what people did, not what helped them.
When to see a doctor. Stop and get help if you have mouth swelling, throat tightness, a rash or trouble breathing. That may be an allergic reaction, and severe reactions need emergency care.
Go to an emergency department at once if you may have eaten a lookalike plant. Warning signs include vomiting, severe stomach pain, numb lips, blurred vision, a slow heartbeat (bradycardia) or an irregular heartbeat (arrhythmia). Take a sample of the plant with you.
See your doctor if a cough lasts more than three weeks, if digestive trouble keeps returning, or if you bruise or bleed more easily than usual.
In the EU, the UK and the US, crow garlic is treated as an ordinary wild food plant, not as an approved medicine. No health claim for it is authorised. In Germany and elsewhere it is also listed as an agricultural weed, and foraging rules differ by region and landowner.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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