Cleavers is a common wild plant (Galium aparine) that has been used for centuries as an herbal remedy, primarily as a diuretic, anti-inflammatory, and lymphatic tonic. It belongs to the Rubiaceae family, the same botanical family as coffee, and goes by a long list of folk names: goosegrass, stickywilly, catchweed bedstraw, and grip grass, among others. If you’ve ever walked through an overgrown field and found a stringy, sticky plant clinging to your clothes, there’s a good chance it was cleavers.
How to Identify Cleavers
Cleavers is an annual plant with weak, square stems that scramble over and through surrounding vegetation rather than standing upright on their own. This gives it a gangly, tangled appearance, and a single plant can spread up to 6 feet. The defining feature is the tiny hooked hairs that cover the stems, leaves, and seeds. These hook-shaped bristles are what make the plant cling to fabric, fur, and skin on contact.
The leaves are another reliable identifier. Like all bedstraw species, cleavers arranges its narrow, lance-shaped leaves in whorls around the stem. Most whorls contain eight leaves, though groups of six or seven also appear. Individual leaves range from about half an inch to just over three inches long. The root system is a shallow, branching taproot that only lasts one growing season, since cleavers is an annual that re-establishes each year from seed. Those seeds are also covered in sticky hooked hairs, which is how the plant hitchhikes to new locations on animals and clothing.
Cleavers vs. Similar Plants
Several other bedstraw species look like cleavers at first glance, but smooth bedstraw (Galium mollugo) is the most common source of confusion. The key differences: smooth bedstraw is a perennial with roots that persist year after year, while cleavers dies off each season. Smooth bedstraw also has noticeably smaller leaves and lacks the prickly texture on its stems, leaves, and fruits. If the plant feels rough and sticky to the touch, it’s almost certainly cleavers. If it feels smooth, it’s likely a different bedstraw species.
Traditional and Modern Uses
Cleavers has a long history in folk medicine across Europe and parts of Asia. Herbalists have traditionally prepared it as a tea or infusion and recommended it as a diuretic (to increase urine output), an alterative (to gradually restore healthy body function), an astringent, and a general tonic. Some herbal preparations containing cleavers are marketed to support the lymphatic and circulatory systems, promote detoxification, and activate the body’s natural immune defenses.
In modern herbal practice, cleavers is most closely associated with lymphatic support. The idea is that it helps the body move fluid through the lymph system more efficiently, reducing puffiness and supporting waste removal. Some herbal skincare products also include cleavers for conditions like psoriasis, though clinical evidence for this use remains limited. It’s worth noting that while these traditional applications are well documented in herbal literature, large-scale human clinical trials confirming specific health outcomes are still lacking.
What Lab Research Shows
While human trials are sparse, laboratory studies have identified several promising biological activities in cleavers extracts. Research published in peer-reviewed journals has confirmed antimicrobial, antioxidant, and wound-healing properties in test-tube and cell-based experiments.
On the antimicrobial front, cleavers extract showed particular effectiveness against Staphylococcus aureus, a common bacterium responsible for skin infections, performing better against it than against other tested bacteria like E. coli. The plant’s antioxidant capacity, measured by its ability to neutralize free radicals, was comparable to vitamin C in one study. Researchers at the National Institutes of Health have also documented immunomodulatory activity, meaning the plant’s compounds appear to influence immune cell behavior in ways that could help regulate inflammation and immune response. These findings align with the traditional uses of cleavers but haven’t yet been replicated in controlled human studies.
How to Prepare Cleavers Tea
Cleavers is most commonly consumed as a cold infusion rather than a standard hot tea. Cold water extraction is preferred because it better preserves the plant’s delicate active compounds. There are two main approaches depending on whether you’re using fresh or dried plant material.
Fresh Cleavers
Harvest about one cup of fresh cleavers and rinse them thoroughly in cold water. Chop the herbs into small pieces, then use a wooden spoon to gently crush them against the inside of a jar. This breaks the cell walls and helps the plant’s active compounds migrate into the water more efficiently. Cover with room-temperature water, then let the jar sit on your counter or in the fridge overnight. Strain and drink.
Dried Cleavers
Use two tablespoons of dried cleavers per cup of room-temperature water. Let it steep for about 10 hours, then strain. The resulting infusion has a mild, slightly grassy flavor that most people find inoffensive.
Cleavers tea is generally used as a seasonal spring tonic, consumed daily for a few weeks at a time rather than year-round.
Safety and Side Effects
As an edible plant, cleavers carries minimal known risk. It isn’t associated with notable side effects, and no interactions with medications or other herbal supplements have been documented. That said, allergic reactions are always possible with any plant. Signs of a reaction include stomach pain, dizziness, hives, itchiness, coughing, or throat swelling.
If you plan to apply cleavers topically for a skin condition, test a small patch of skin first to check for irritation before covering a larger area. One practical consideration: in the United States, the FDA does not regulate herbal supplements the same way it regulates prescription drugs, so the quality and contents of commercial cleavers products can vary. Buying from reputable sources with third-party testing helps reduce that uncertainty.