Japanese Knotweed

Invasive Plants – New rules have been established effective January 7, 2018

Among Top Invasive plants
Lythrum virgatum, European wand loosestrife
In September of 2014, the Ohio General Assembly granted the Ohio Department of Agriculture (ODA) the exclusive authority to regulate invasive plants species. Under the law invasive plants are defined as plant species that are not native to Ohio whose introduction causes or is likely to cause economic or environmental harm, or harm to human health as determined by scientific studies. After nearly two years of stakeholder outreach, new rules have been established and are effective as of January 7, 2018.

We are reaching out to make you aware of these new regulations and the list of invasive plants in the state of Ohio. These rules prohibit the sale and distribution of invasive plants in the state of Ohio. Further, the rules establish a committee which will advise ODA on matters regarding invasive plants. In some cases businesses may have invested considerable time and resources into growing some of these plants. These rules include a grace period for the prohibition to take effect for some species, which allows businesses time to transition toward alternative plants to market as replacements.


The following plants are considered invasive in the State of Ohio effective January 7, 2018 except as otherwise noted:

    Ailanthus altissima, tree-of-heaven
    Alliaria petiolata, garlic mustard
    Berberis vulgaris, common barberry
    Butomus umbellatus, flowering rush
    Celastrus orbiculatus, Oriental bittersweet
    Centaurea stoebe ssp. Micranthos, spotted knapweed
    Dipsacus fullonum, common teasel
    Dipsacus laciniatus, cutleaf teasel
    Egeria densa, Brazilian elodea
    Elaeagnus angustifolia, Russian olive
    Elaeagnus umbellata, autumn olive
    Epilobium hirsutum; hairy willow herb
    Frangula alnus, glossy buckthorn
    Heracleum mantegazzianum, giant hogweed
    Hesperis matronlis, Dame’s rocket
    Hydrilla verticillata, hydrilla
    Hydrocharis morsus-ranae, European frog-bit
    Lonicera japonica, Japanese honeysuckle
    Lonicera maackii, amur honeysuckle
    Lonicera morrowii, Morrow’s honeysuckle
    Lonicera tatarica, tatarian honeysuckle
    Lythrum salicaria, purple loosestrife
    Microstegium vimineum, Japanese stiltgrass
    Myriophyllum aquaticum, parrotfeather
    Myriophyllum spicatum, Eurasian water-milfoil
    Nymphoides peltata, yellow floating heart
    Phragmites australis, common reed
    Potamogeton crispus, curly-leaved pondweed
    Pueraria montana var. lobate, kudzu
    Ranunculus ficaria, fig buttercup/lesser celandine
    Rhamnus cathartica, European buckthorn
    Rosa multiflora; multiflora rose
    Trapa natans, water chestnut
    Typha angustifolia, narrow-leaved cattail
    Typha x glauca, hybrid cattail
    Vincetoxicum nigrum, black dog-strangling vine, black swallowwort
    Lythrum virgatum, European wand loosestrife (effective January 7, 2019)
    Pyrus calleryana, callery pear (effective January 7, 2023)

For more information please contact the Plant Pest Control Section at 614-728-6400, plantpest@agri.ohio.gov or contact your local nursery inspector.