Getting rid of buckthorn requires removing the existing plants, preventing regrowth from the stump and seed bank, and filling the gap with native vegetation so the invader cannot reclaim the space. Skip any one of those steps and you will likely be fighting the same battle a few years later. Common buckthorn (Rhamnus cathartica) is one of the most stubborn invasive shrubs in North America, and its biology explains why a single afternoon with a chainsaw rarely solves the problem. Here is how to approach it methodically, from assessment through long-term restoration.
Why Buckthorn Is So Difficult to Eradicate
Before you start cutting, it helps to understand what you are up against. Buckthorn leafs out earlier in spring and holds its leaves longer in autumn than most native trees and shrubs. That extended growing season lets it photosynthesize during windows when the native canopy is bare, giving it a competitive edge in light-limited forests.1Forest Ecology and Management. Phenology matters: Extended spring and autumn canopy cover increases biotic resistance of forests to invasion by common buckthorn (Rhamnus cathartica) Its dark green leaves in late October and early November are actually a useful identification cue when everything else has gone brown.
Buckthorn also wages a kind of chemical warfare. Research has found that its leaf litter slows or prevents germination of native wildflowers, and its soil chemistry inhibits native plant growth even when the canopy is removed. The soil effects alone suppressed native species at least as much as the shade did, pointing to allelopathic compounds that linger after the plant is gone.2Wiley. Above‐ and Belowground Impacts of European Buckthorn (Rhamnus cathartica) on Four Native Forbs And then there is the seed bank. A single mature female buckthorn can produce hundreds of berries each fall, and birds love them. Seeds can remain viable in the soil for years, ready to germinate the moment light hits the forest floor. If you cut a dense thicket and walk away, you are essentially creating ideal conditions for the next generation.
Assessing Your Site
Walk the area first and get a rough sense of what you are dealing with. Note the size of the buckthorn stems, the density of the infestation, and whether you are working in a woodland, a hedgerow, or an open field. This determines your approach:
- Seedlings and small plants (under an inch in diameter): Hand-pulling or weed wrenches work well, especially in moist soil.
- Mid-size stems (roughly one to three inches): Basal bark herbicide treatment is efficient and can be done in most seasons.
- Large trees (over three inches): Cut-stump treatment with herbicide is the standard method.
- Dense thickets with mixed sizes: A combination of all of the above, usually done in phases over two or more years.
Also look at what native plants still exist on the site. A woodland with a surviving understory of ferns, sedges, or native shrubs will recover faster than one where buckthorn has completely dominated the ground layer. Knowing this shapes how aggressively you need to replant later.
Hand-Pulling and Mechanical Removal
For seedlings and young plants, pulling by hand is straightforward and avoids herbicide entirely. The key is getting the root. Buckthorn has a tough taproot, and any fragment left behind can resprout. Pull when the soil is damp after rain, which makes it much easier to extract the whole root system. A weed wrench or similar leverage tool lets you uproot plants up to about two inches in diameter without breaking your back.
For larger plants, you can use a brush cutter, handsaw, or chainsaw to fell the stem. Cut as close to the ground as possible. The problem with cutting alone is that buckthorn stumps resprout vigorously. A cut stump left untreated will send up multiple new stems, sometimes creating a bushier plant than you started with. That is why most land managers pair cutting with an immediate herbicide application.
Cut-Stump Herbicide Treatment
This is the workhorse method for stems larger than about an inch. Cut the buckthorn as low as you can, then apply herbicide directly to the freshly cut stump surface within minutes. The cambium layer just under the bark is what carries the herbicide down to the roots, so concentrate the application on the outer ring of the stump rather than the dead heartwood in the center.
The most commonly used herbicides for cut-stump work on buckthorn are triclopyr and glyphosate. Triclopyr-based products (often sold as Garlon or Pathfinder) are selective for broadleaf plants, meaning they are less likely to harm nearby grasses and sedges. Glyphosate (the active ingredient in Roundup and many generics) is non-selective, so it can damage anything green it contacts. For cut-stump application, either works, since you are painting it directly onto the wood rather than spraying foliage.
Late summer through winter is a good window for cut-stump treatment. The plant is actively transporting sugars down to its roots during fall, which helps carry the herbicide to the root system. Winter applications work well too, since there is less risk of the herbicide contacting non-target plants. Just avoid treating stumps when they are wet from rain or covered in snow, as the herbicide will not adhere properly.
Basal Bark Treatment
For mid-size buckthorn stems, basal bark treatment offers a way to kill the plant standing, without cutting it first. You apply a triclopyr-in-oil solution to the lower twelve to eighteen inches of the bark, all the way around the stem and down to the ground line. The oil-based carrier penetrates the bark and delivers the herbicide to the cambium. The plant dies over the following weeks or months, and the standing dead stem can be removed later or left to decompose.
One of the practical advantages of basal bark treatment is its long application window. It can be applied during any season, including winter months, as long as snow does not prevent you from spraying all the way to the ground line and the stem surface is not saturated with water.3Penn State Extension. Using Basal Bark Herbicide Applications to Control Understory Tree Species This makes it especially useful for winter work, when the lack of foliage makes buckthorn easier to spot (remember those late-hanging green leaves) and when frozen ground reduces soil disturbance.
Basal bark treatment tends to be most effective on stems under about six inches in diameter. Thicker bark on larger trees can reduce penetration. For very large buckthorn, cut-stump or hack-and-squirt methods (making downward cuts into the bark and injecting herbicide) are more reliable.
The Seed Bank Problem
Even after you kill every standing buckthorn, the soil is loaded with seeds. This is where many removal efforts stall. A single clearing event opens the canopy, floods the ground with light, and triggers a flush of buckthorn seedlings from the existing seed bank. If you do not manage those seedlings, you will have a dense stand of young buckthorn within a few years.
Plan on returning to your site at least once or twice a year for several years to pull or spot-treat new seedlings. Spring is a good time because buckthorn seedlings are easy to identify: they are among the first things to green up, and their glossy, dark leaves with fine-toothed margins stand out against the bare soil. Catching them young, before they develop a substantial root system, makes removal much easier.
If your site is large enough and local regulations allow it, prescribed burning after the initial removal can dramatically reduce woody regrowth. Research on sites where buckthorn had been cleared found that seeding native grasses before burning nearly doubled the area that actually burned, because the grass litter provided the fine fuel that carries fire across the ground. One year after burning, plots that had been seeded with native grasses had about 72% less woody cover than adjacent unseeded areas.4BioOne (Natural Areas Journal). Understory Revegetation Enhances Efficacy of Prescribed Burning after Common Buckthorn (Rhamnus cathartica) Management Burning alone helped too, but the combination of seeding and fire was far more effective at keeping buckthorn from bouncing back.
Revegetation Is Not Optional
This is the step that separates successful long-term buckthorn removal from an endless cycle of cutting and retreating. Bare ground after buckthorn removal is an open invitation for reinvasion, both from the seed bank and from seeds carried in by birds. Filling that space with native plants creates shade and root competition that buckthorn seedlings struggle to overcome.
A four-year field experiment tested how different revegetation approaches performed against buckthorn reinvasion. Planting native shrubs was the most effective strategy, reducing light reaching buckthorn seedlings by about two-thirds and cutting their year-over-year survival roughly in half. Considering both reduced survival and stunted growth, shrub plantings reduced overall buckthorn invasion by about 89%. Native tree plantings achieved around 81% reduction, sedge plantings about 66%, and even broadcast seeding alone cut invasion roughly in half.5Ecological Engineering. Using plants to control buckthorn (Rhamnus cathartica): Improved biotic resistance of forests through revegetation The logic tracks with buckthorn’s biology: it relies on light gaps during spring and fall to outcompete native plants, so anything that fills those gaps undermines its main advantage.1Forest Ecology and Management. Phenology matters: Extended spring and autumn canopy cover increases biotic resistance of forests to invasion by common buckthorn (Rhamnus cathartica)
Which species to plant depends on your region and site conditions, but the general principle is to aim for a layered canopy. Native shrubs like dogwoods, viburnums, or hazelnuts fill the understory layer quickly. Native sedges and ferns provide ground cover. If the overstory canopy is thin, planting shade-tolerant native trees helps close the gap over time. Local native plant nurseries and cooperative extension offices can recommend species for your specific area.
Disposing of Buckthorn Debris
Buckthorn disposal requires a little more thought than tossing brush in a pile. Female plants bearing berries are the biggest concern, because those berries contain viable seeds that birds or flooding could spread to new areas. Cut stems without berries can be chipped, stacked in brush piles, or left to decompose on site. Stems with berries should either be burned, bagged and sent to a landfill, or composted at a facility that reaches adequate temperatures.
Composting does work for destroying buckthorn seeds, but it needs to be proper hot composting rather than a backyard leaf pile. Research found that commercial composting rendered buckthorn seeds completely nonviable within about two weeks, regardless of the composting method used. The sustained high temperatures in commercial operations kill the seeds well within the normal composting timeframe.6Invasive Plant Science and Management. Composting Reduces Seed Viability of Garlic Mustard (Alliaria petiolata) and Common Buckthorn (Rhamnus cathartica) A passive backyard compost pile that never heats up consistently, however, may not get the job done. If you are not sure your composting setup reaches high enough temperatures, burning or bagging the berry-laden material is the safer bet.
A Realistic Timeline
Expect the process to take three to five years from initial removal to a point where buckthorn is under control rather than dominant. Here is a rough sequence for a moderately infested woodland:
- Year one, fall or winter: Cut and treat large and mid-size buckthorn. Basal-bark-treat any stems you want to kill standing. Dispose of debris carefully.
- Year one or two, spring: Return to pull or spot-treat the wave of seedlings that will emerge once light hits the soil.
- Year two: Plant native shrubs, trees, and ground-layer species. If the site is appropriate, seed native grasses and plan a prescribed burn for the following year.
- Years two through five: Monitor at least annually, pulling or treating any new buckthorn. As native plantings establish, the need for intervention drops.
Patience matters more than perfection in any single year. A site where you remove 90% of the buckthorn in year one, seed natives, and follow up consistently will end up in better shape than a site where you clear everything perfectly once and never return.
The Agricultural Angle
If you live in the upper Midwest or southern Ontario, there is an additional reason to care about buckthorn on your property or in nearby hedgerows. Common buckthorn serves as the primary overwintering host for the soybean aphid, one of the most economically damaging insect pests of soybeans in North America.7Biological Invasions. European buckthorn and Asian soybean aphid as components of an extensive invasional meltdown in North America The aphids spend summers on soybean plants but need buckthorn to complete their lifecycle over winter. Buckthorn also hosts oat crown rust, a fungal disease that affects oat crops.7Biological Invasions. European buckthorn and Asian soybean aphid as components of an extensive invasional meltdown in North America Removing buckthorn from agricultural hedgerows and woodland edges is not just an ecological project; it can reduce pest pressure on neighboring cropland.8PubMed. Modeling distribution and abundance of soybean aphid in soybean fields using measurements from the surrounding landscape
This connection also means that some agricultural agencies and soil and water conservation districts offer cost-share programs or technical assistance for buckthorn removal, particularly in soybean-growing regions. It is worth checking with your county extension office or local conservation district to see whether funding is available. Collective removal across neighboring properties is far more effective than isolated efforts, since birds can reintroduce seeds from untreated areas nearby.
Herbicide-Free Approaches and Their Limits
Many landowners prefer to avoid herbicides, whether because of proximity to water, organic certification, personal preference, or concern about non-target damage. Mechanical removal alone can work, but it demands significantly more labor and follow-up. Without herbicide on cut stumps, expect vigorous resprouting. You will need to re-cut resprouts repeatedly, sometimes for several seasons, to exhaust the root reserves. Some practitioners cover cut stumps with black plastic or metal cans to block light and suppress regrowth, though this is labor-intensive for large infestations.
Goat browsing has gained popularity as a buckthorn control method, and goats will eat buckthorn foliage and bark. They are best suited to reducing the volume of a dense thicket rather than eradicating it entirely. Goats will not kill large stems outright, but repeated heavy browsing over multiple seasons can weaken plants and reduce berry production. Combining goat browsing with follow-up hand-pulling of weakened plants is a reasonable herbicide-free strategy for small to moderate infestations where you have access to a grazing operation.
Regardless of the removal method, revegetation remains critical. The research showing that native shrub plantings cut buckthorn reinvasion by nearly 90% applies whether you used herbicide or not.5Ecological Engineering. Using plants to control buckthorn (Rhamnus cathartica): Improved biotic resistance of forests through revegetation The native plants do much of the long-term suppression work that herbicide cannot, by claiming the light and soil resources that buckthorn needs to reestablish.
Identifying Buckthorn Correctly
Before you embark on a removal campaign, make sure you are cutting the right plant. Common buckthorn can be confused with native species like wild plum, chokecherry, or native buckthorn species (alder-leaved buckthorn, for instance, is native to parts of eastern North America). Key identification features of common buckthorn include sub-opposite leaf arrangement (leaves are nearly, but not perfectly, opposite each other on the stem), fine-toothed leaf margins with veins that curve toward the leaf tip, a short thorn at the tip of many twigs, and dark berries that ripen from green to black in late summer. The inner bark is distinctly yellow-orange when scratched, which is one of the most reliable field marks year-round.
In late fall, identification becomes almost trivially easy. Common buckthorn holds its green leaves weeks after native deciduous species have dropped theirs. Walking through a November woodland, the green shrubs are overwhelmingly likely to be buckthorn, honeysuckle, or occasionally privet. Confirming the yellow inner bark and sub-opposite leaf arrangement seals the identification. This is also why fall and early winter are popular times to begin removal work: you can see exactly what you are targeting while the rest of the forest is dormant.