GREON manages invasive plants according to the species, extent of growth and site conditions. We assess the location before choosing an appropriate combination of mechanical work, authorised treatment and follow-up monitoring.
We work on overgrown private plots, commercial grounds and public areas. Send the location, approximate area, photographs of the whole plant and close-ups of leaves and stems.
The aim is to limit unwanted spread and agree ongoing management. Persistent growth may require repeated treatment; removing above-ground parts once may not be enough.
We work mainly in Prague and Central Bohemia. Near watercourses, in protected locations or where soil is being moved, we first assess site restrictions and suitable handling of removed material.
Is knotweed, giant hogweed or another unwanted species spreading across your land? Below are key species to watch for. Control always starts with identifying the species and assessing the site.
Japanese, giant and Bohemian knotweed
Reynoutria japonica · R. sachalinensis · R. × bohemicaFor growth with underground rhizomes, we plan repeated treatment and monitoring. When handling soil and plant remains, preventing fragments from spreading to new areas is essential.
Giant hogweed
Heracleum mantegazzianumWe assess the growth, surroundings and appropriate timing before treatment. If identification is uncertain, leave it undisturbed and send photographs taken from a safe distance.
Himalayan balsam
Impatiens glanduliferaPreventing seed set and monitoring new seedlings are important for this annual species. The method also takes nearby watercourses into account.
Tree of heaven, black locust, box elder and black cherry
Ailanthus altissima · Robinia pseudoacacia · Acer negundo · Prunus serotinaFelling alone may not suppress regrowth, especially in tree of heaven. We agree the control method and necessary follow-on work first.
Canadian goldenrod, giant goldenrod and large-leaved lupin
Solidago canadensis · S. gigantea · Lupinus polyphyllusWe determine the work according to the density, surroundings and previous maintenance. Ongoing care forms part of the agreement.
Common ragweed and common milkweed
Ambrosia artemisiifolia · Asclepias syriacaWe identify unfamiliar vegetation first. The method and material handling are not chosen from the size of the area alone.
Other significant invasive plants include Jerusalem artichoke, cut-leaved coneflower, Telekia speciosa, small balsam, Lycium barbarum and eastern white pine. The need for intervention varies by habitat; this is not an instruction to remove every occurrence.
The Catalogue of alien plants of the Czech Republic (Pyšek et al., 2022), referenced by AOPK ČR, identifies 75 invasive taxa. The complete botanical list from that edition follows. It is neither a list of plants that must always be removed nor an automatic offer to treat every species. The EU Union list is a separate document.
The need for control depends on the individual occurrence and its effects. A tree's inclusion in the catalogue alone does not establish a need to fell it in a garden or park.
Technical sources: Overview of significant invasive plants · AOPK ČR · Invasive-plant management standard · AOPK ČR · Control principles · AOPK ČR · Catalogue of alien plants of the Czech Republic · Pyšek et al., 2022. Content checked on 17 October 2026.
We manage unwanted growth according to the species and extent, including agreement on follow-up monitoring.
Aftercare depends on the identified species. For recurring growth, we agree inspections and any follow-up treatment.
Removing above-ground growth once may not prevent further growth. The method and repetition depend on the species.
OUR INVASIVE-PLANT CONTROL PROCESS
We first identify the plant and the boundaries of the growth. We then agree the permitted treatment, material handling and follow-up assessment.
We assess the species, extent, access and surroundings, accounting for previous treatments and site restrictions.
We carry out the agreed treatment. Chemical treatment is considered only where the product and its use are authorised for the site.
We agree checks for regrowth and any repeat treatment. Biomass and soil handling are planned to prevent further spread.
Cost depends on the species, area and density, access, chosen method and handling of removed material. It also reflects agreed inspections and repeat treatments.
Send photographs and the site location. The quote will clarify the initial treatment and subsequent care; area alone does not determine the final price.
LEAVE IT TO US
We first assess the plant, its distribution on site and the conditions for treatment.
We adapt the method to the plant and habitat; chemical use is not automatic.
We agree regrowth checks and ongoing maintenance. The outcome also depends on follow-up care.
We particularly assess knotweeds, giant hogweed, Himalayan balsam, tree of heaven and goldenrods. For other species, we first confirm identification, extent and treatment conditions. Send an overview, a close-up of the plant and the location.
A single cut is generally not a long-term control plan. Knotweed can regrow from rhizomes, while preventing seed set matters for Himalayan balsam. The number of treatments and checks depends on the species and how the vegetation develops.
Agree the method with us first. Moving soil or plant remains without a plan can spread the growth. Removing it beforehand can also make identification harder.
No. The method depends on the species, habitat and site restrictions. Any chemical treatment must meet the product's authorised use and site conditions, with particular attention near water and in protected areas.
We work mainly in Prague and Central Bohemia. Other regions are considered according to location, scope and equipment needs. We confirm the approach and team availability beforehand.
Species, area and density, access, material handling and repeat treatments determine the cost. The quote separates the initial work from agreed inspections. We do not promise permanent removal in a single visit.
Japanese knotweed — illustrative photograph of an invasive species. Krzysztof Golik · CC BY-SA 4.0. Resized, converted to WebP and cropped for responsive display; no changes to the image content.
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