How to Remove Japanese Knotweed | Trees Atlanta

These recommendations are primarily for homeowners and communities that would like to start working in their neighborhood greenspace. For each species we recommend herbicide-free control methods, but have added an herbicide option for some species for those who are comfortable using them. These methods were selected while keeping in mind limiting soil disturbance, reducing herbicide use, and avoiding harm to other species that may be present whether they be other plants/animals. Manual removal is possible for all of them if you have the time. If the infestation is overwhelmingly severe or these tips aren’t proving effective, we suggest you consider qualified professional services.

Japanese Knotweed

Fallopia japonica – Georgia EPPC Category 1 Alert (significant potential to become a serious problem in Georgia)

This plant is one of the hardest plants to remove, even professionally.

Japanese Knotweed

Japanese knotweed leaves and flowers.

Japanese knotweed stems

Japanese knotweed stems.

Girdle

First clear out the surface growth from previous growing seasons. Then, cover the area with a wire fence mesh with ½” x ½” openings. Fasten the fencing material down so that it will stay put throughout the growing season. The knotweed stems will grow through the steel mesh. As they grow, they will expand in diameter. Eventually, they will push against the mesh and girdle themselves. The surface growth will die back, but the rhizome will continue to push new stems through the wire mesh. The stems will continue to girdle themselves until the rhizomes carbohydrate reserves are depleted.

Girdling Japanese knotweed

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“Category” refers to description of invasiveness based on information from the Georgia and North Carolina Exotic Pest Plant Council (EPPC) and do not necessarily reflect the severity of invasions in Atlanta specifically. View our Resource “Atlanta’s Top Invasive Plants (A to Z) Expanded List” for more information.

A great opportunity to learn is volunteering with us at a Forest Restoration project. Please view our Calendar of upcoming service projects or consider enrolling in our annual Forest Stewardship training program. For other species removal, also read: How to Remove Our Top 10 Invasive Plants.

If you have any questions about this guide please email restoration@treesatlanta.org.

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1. Magnolia Collection

Magnolias are part of an ancient lineage of flowering plants dating back approximately 95 million years. The Atlanta BeltLine Arboretum is home to 18 types of magnolias from evergreen to flowering. Two magnolias in particular have witnessed history as they were planted just beyond the outfield wall for the former Ponce de Leon Park, where the Atlanta Crackers played baseball. Babe Ruth and Eddie Matthews both hit home runs that were caught in the canopy of one of these magnolia trees. As part of Arboretum experimentation, we have taken cuttings from these historic magnolias and grown them into new trees so that this piece of history can live on the Atlanta BeltLine Arboretum and in new parks and baseball fields around Atlanta.

2. 33 Oaks

The oak trees on this slope and throughout the Arboretum represent many ecosystems in Georgia, from bottomland hardwood swamps to granite outcrops. Of the approximately 90 species of oaks native to the United States, 33 are native to Georgia. All 33 oaks are growing on this slope and between them dance 33 stainless steel leaf sculptures – one for each tree.

These metal oaks were designed and crafted by David Landis of Landis Sculpture Studio. Learn more about David’s work here. For more information about the individual oaks featured, see our fact sheet here.

To learn more general information about our Georgia oaks, check out this video here.

3. Beech Circle

Among the stateliest of our native trees, beeches are indicative of a mature forest. Though they can take around 40 years to produce a large quantity of nuts, beech trees are critical for wildlife. Beeches provide food and shelter for all kinds of birds and mammals, such as the red-headed woodpecker. Dubbed the fairy ring, the circle of beech trees here surrounds a granite outdoor classroom and gathering place where you can contemplate how the beech trees will look in 3, 5, and 10 years!

4. Eastside Azalea Collection

Despite the native azalea holding the title of Georgia’s State Wildflower, it is underused in the landscape. The Atlanta BeltLine Arboretum is now home to the largest public native azalea collection in the Atlanta Area with over 300 azaleas on display. The collection highlights over 25 species, cultivars, and varieties, and is home to all 13 azaleas native to the state of Georgia. This collection focuses on named cultivars (varieties that have been selected for depending on color, size, bloom time, etc.) within two series called the Georgia Moon Series and the Sunrise to Sunset Series. The Georgia Moon Series will have fragrant white-blooming Georgia native species, and the Sunrise to Sunset Series will be comprised of Georgia native species in warm orange, reds, and soft yellows blooming from March – July.

5. Stumpery Garden

The Stumpery Garden is a horticultural oddity, serving as a public place for learning and exploration and demonstrating how trees can be utilized in a beautiful way. Stumpery gardens utilize dead, fallen, and storm-damaged trees as an asset to the garden – providing critical habitat for beetles, frogs, birds, and small mammals such as chipmunks. Whole logs are placed upside down to display their root structure, and logs, branches, and pieces of bark are arranged to form walls and archways. Plants such as ferns, lichen, mosses, soft grasses, and trailing plants are encouraged to grow on and around them.

Take a virtual tour of the Stumpery Garden here.

6. Westside Azalea Collection

Different from the Eastside collection, the Westside collection has all straight species and natural varieties that encourage free hybridization. These azaleas are all grown from seed so there are many variations in the hues even between the same species.

7. Persimmon Woods

Home to the largest American persimmon tree in the state of Georgia, this remnant old growth forest on 1.3 acres provides habitat to a variety of deep forest flora. Walking through a nature trail and over a few bridges will bring you up close and personal with woodland groundcovers, rare spring ephemerals (plants with a short life cycle) such as trillium, and a large collection of native woody species. Enjoy the seasonal blooms, learn from plant identification signs, and get hands-on with volunteer opportunities to plant, divide woodland perennials, and collect seed.

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