Bohemian Knotweed – Polygonum x bohemicum Not recorded hereProhibited
Recorded in no Colorado county. Colorado lists Bohemian Knotweed under “List A.”
Colorado noxious weeds
Colorado (CO) lists 78 plants as noxious weeds under 8 CCR 1206-2. Colorado's list is an agricultural noxious-weed law, which governs control and spread on farmland and rights of way rather than what a nursery may sell.
What plants are invasive in Colorado?
Colorado names 78 plants, including Purple Loosestrife, Waterthyme and Japanese Knotweed. A noxious-weed listing obliges control and limits movement; it does not by itself ban nursery sale. 67 of the 78 are also flagged invasive by GRIIS, which is an ecological finding rather than a ruling by Colorado. Checked against 8 CCR 1206-2 on July 20, 2026.
Camelthorn – Alhagi maurorum Not recorded hereInvasive
Invasive in the US, and recorded in no Colorado county. Colorado lists Camelthorn under “List A.”
Codlins and Cream – Epilobium hirsutum Not recorded hereInvasive
Invasive in the US, and recorded in no Colorado county. Colorado lists Codlins and Cream under “List A.”
Common Crupina – Crupina vulgaris Not recorded hereInvasive
Invasive in the US, and recorded in no Colorado county. Colorado lists Common Crupina under “List A.”
Creeping Spurge – Euphorbia myrsinites IntroducedProhibited
Recorded in 3 of Colorado’s 64 counties. Colorado lists Creeping Spurge under “List A.”
Cypress Spurge – Euphorbia cyparissias IntroducedInvasive
Invasive in the US, and recorded in 1 of Colorado’s 64 counties. Colorado lists Cypress Spurge under “List A.”
Dyer's Woad – Isatis tinctoria IntroducedInvasive
Invasive in the US, and recorded in 2 of Colorado’s 64 counties. Colorado lists Dyer's Woad under “List A.”
Elongated Mustard – Brassica elongata Not recorded hereProhibited
Recorded in no Colorado county. Colorado lists Elongated Mustard under “List A.”
Flowering Rush – Butomus umbellatus Not recorded hereInvasive
Invasive in the US, and recorded in no Colorado county. Colorado lists Flowering Rush under “List A.”
Giant Knotweed – Polygonum sachalinense Not recorded hereInvasive
Invasive in the US, and recorded in no Colorado county. Colorado lists Giant Knotweed under “List A.”
Giant Reed – Arundo donax Not recorded hereInvasive
Invasive in the US, and recorded in no Colorado county. Colorado lists Giant Reed under “List A.”
Harmal Peganum – Peganum harmala Not recorded hereInvasive
Invasive in the US, and recorded in no Colorado county. Colorado lists Harmal Peganum under “List A.”
Japanese Knotweed – Fallopia japonica (potentially invasive weed) IntroducedInvasive
Invasive in the US, and recorded in 1 of Colorado’s 64 counties. Colorado lists Japanese Knotweed under “List A.”
Kariba-Weed – Salvinia molesta Not recorded hereInvasive
Invasive in the US, and recorded in no Colorado county. Colorado lists Kariba-Weed under “List A.”
Meadow Knapweed – Centaurea x moncktonii Not recorded hereProhibited
Recorded in no Colorado county. Colorado lists Meadow Knapweed under “List A.”
Mediterranean Sage – Salvia aethiopis IntroducedInvasive
Invasive in the US, and recorded in 1 of Colorado’s 64 counties. Colorado lists Mediterranean Sage under “List A.”
Medusahead – Taeniatherum caput-medusae Not recorded hereInvasive
Invasive in the US, and recorded in no Colorado county. Colorado lists Medusahead under “List A.”
North Africa Grass – Ventenata dubia Not recorded hereInvasive
Invasive in the US, and recorded in no Colorado county. Colorado lists North Africa Grass under “List A.”
Orange Hawkweed – Hieracium aurantiacum IntroducedInvasive
Invasive in the US, and recorded in 4 of Colorado’s 64 counties. Colorado lists Orange Hawkweed under “List A.”
Paleyellow Iris – Iris pseudacorus Not recorded hereInvasive
Invasive in the US, and recorded in no Colorado county. Colorado lists Paleyellow Iris under “List A.”
Parrot Feather Watermilfoil – Myriophyllum aquaticum Not recorded hereInvasive
Invasive in the US, and recorded in no Colorado county. Colorado lists Parrot Feather Watermilfoil under “List A.”
Purple Loosestrife – Lythrum salicaria IntroducedInvasive
Invasive in the US, and recorded in 4 of Colorado’s 64 counties. Colorado lists Purple Loosestrife under “List A.”
Rush Skeletonweed – Chondrilla juncea Not recorded hereInvasive
Invasive in the US, and recorded in no Colorado county. Colorado lists Rush Skeletonweed under “List A.”
Squarrose Knapweed – Centaurea virgata Not recorded hereProhibited
Recorded in no Colorado county. Colorado lists Squarrose Knapweed under “List A.”
Stinking Willie – Senecio jacobaea Not recorded hereInvasive
Invasive in the US, and recorded in no Colorado county. Colorado lists Stinking Willie under “List A.”
Waterthyme – Hydrilla verticillata Not recorded hereInvasive
Invasive in the US, and recorded in no Colorado county. Colorado lists Waterthyme under “List A.”
Yellow Star-Thistle – Centaurea solstitialis IntroducedInvasive
Invasive in the US, and recorded in 2 of Colorado’s 64 counties. Colorado lists Yellow Star-Thistle under “List A.”
Absinthium – Artemisia absinthium IntroducedInvasive
Invasive in the US, and recorded in 3 of Colorado’s 64 counties. Colorado lists Absinthium under “List B.”
Black Henbane – Hyoscyamus niger IntroducedInvasive
Invasive in the US, and recorded in 7 of Colorado’s 64 counties. Colorado lists Black Henbane under “List B.”
Bouncingbet – Saponaria officinalis IntroducedInvasive
Invasive in the US, and recorded in 9 of Colorado’s 64 counties. Colorado lists Bouncingbet under “List B.”
Broadleaved Pepperweed – Lepidium latifolium IntroducedInvasive
Invasive in the US, and recorded in 10 of Colorado’s 64 counties. Colorado lists Broadleaved Pepperweed under “List B.”
Broomleaf Toadflax – Linaria genistifolia Not recorded hereListed
Recorded in no Colorado county. Colorado lists Broomleaf Toadflax under “List B.”
Bulbous Bluegrass – Poa bulbosa IntroducedInvasive
Invasive in the US, and recorded in 9 of Colorado’s 64 counties. Colorado lists Bulbous Bluegrass under “List C.”
Bull Cottonthistle – Onopordum tauricum IntroducedListed
Recorded in 2 of Colorado’s 64 counties. Colorado lists Bull Cottonthistle under “List B.”
Bull Thistle – Cirsium vulgare IntroducedInvasive
Invasive in the US, and recorded in 8 of Colorado’s 64 counties. Colorado lists Bull Thistle under “List B.”
Butter and Eggs – Linaria vulgaris IntroducedInvasive
Invasive in the US, and recorded in 19 of Colorado’s 64 counties. Colorado lists Butter and Eggs under “List B.”
Canada Thistle – Cirsium arvense IntroducedInvasive
Invasive in the US, and recorded in 26 of Colorado’s 64 counties. Colorado lists Canada Thistle under “List B.”
Caraway – Carum carvi IntroducedInvasive
Invasive in the US, and recorded in 10 of Colorado’s 64 counties. Colorado lists Caraway under “List B.”
Cheatgrass – Bromus tectorum IntroducedInvasive
Invasive in the US, and recorded in 42 of Colorado’s 64 counties. Colorado lists Cheatgrass under “List C.”
Chicory – Cichorium intybus IntroducedInvasive
Invasive in the US, and recorded in 6 of Colorado’s 64 counties. Colorado lists Chicory under “List C.”
Common Mullein – Verbascum thapsus IntroducedInvasive
Invasive in the US, and recorded in 19 of Colorado’s 64 counties. Colorado lists Common Mullein under “List C.”
Common St. Johnswort – Hypericum perforatum IntroducedInvasive
Invasive in the US, and recorded in 7 of Colorado’s 64 counties. Colorado lists Common St. Johnswort under “List C.”
Cutleaf Teasel – Dipsacus laciniatus IntroducedInvasive
Invasive in the US, and recorded in 1 of Colorado’s 64 counties. Colorado lists Cutleaf Teasel under “List B.”
Dalmatian Toadflax – Linaria dalmatica IntroducedInvasive
Invasive in the US, and recorded in 14 of Colorado’s 64 counties. Colorado lists Dalmatian Toadflax under “List B.”
Dames Rocket – Hesperis matronalis IntroducedInvasive
Invasive in the US, and recorded in 3 of Colorado’s 64 counties. Colorado lists Dames Rocket under “List B.”
Diffuse Knapweed – Centaurea diffusa IntroducedInvasive
Invasive in the US, and recorded in 7 of Colorado’s 64 counties. Colorado lists Diffuse Knapweed under “List B.”
Eurasian Watermilfoil – Myriophyllum spicatum Not recorded hereInvasive
Invasive in the US, and recorded in no Colorado county. Colorado lists Eurasian Watermilfoil under “List B.”
Field Bindweed – Convolvulus arvensis IntroducedInvasive
Invasive in the US, and recorded in 27 of Colorado’s 64 counties. Colorado lists Field Bindweed under “List C.”
Field Sowthistle – Sonchus arvensis IntroducedInvasive
Invasive in the US, and recorded in 15 of Colorado’s 64 counties. Colorado lists Field Sowthistle under “List C.”
Fuller's Teasel – Dipsacus fullonum IntroducedListed
Recorded in 3 of Colorado’s 64 counties. Colorado lists Fuller's Teasel under “List B.”
Gypsyflower – Cynoglossum officinale IntroducedInvasive
Invasive in the US, and recorded in 20 of Colorado’s 64 counties. Colorado lists Gypsyflower under “List B.”
Johnsongrass – Sorghum halepense IntroducedInvasive
Invasive in the US, and recorded in 5 of Colorado’s 64 counties. Colorado lists Johnsongrass under “List C.”
Jointed Goatgrass – Aegilops cylindrica IntroducedInvasive
Invasive in the US, and recorded in 13 of Colorado’s 64 counties. Colorado lists Jointed Goatgrass under “List B.”
Knapweed – Centaurea x psammogena Not recorded hereInvasive
Invasive in the US, and recorded in no Colorado county. Colorado lists Knapweed under “List B.”
Leafy Spurge – Euphorbia esula IntroducedInvasive
Invasive in the US, and recorded in 18 of Colorado’s 64 counties. Colorado lists Leafy Spurge under “List B.”
Lenspod Whitetop – Cardaria chalepensis IntroducedListed
Recorded in 18 of Colorado’s 64 counties. Colorado lists Lenspod Whitetop under “List B.”
Lesser Burdock – Arctium minus IntroducedInvasive
Invasive in the US, and recorded in 10 of Colorado’s 64 counties. Colorado lists Lesser Burdock under “List C.”
Moth Mullein – Verbascum blattaria IntroducedInvasive
Invasive in the US, and recorded in 2 of Colorado’s 64 counties. Colorado lists Moth Mullein under “List B.”
Nodding Plumeless Thistle – Carduus nutans IntroducedInvasive
Invasive in the US, and recorded in 14 of Colorado’s 64 counties. Colorado lists Nodding Plumeless Thistle under “List B.”
Oriental Virginsbower – Clematis orientalis IntroducedListed
Recorded in 5 of Colorado’s 64 counties. Colorado lists Oriental Virginsbower under “List B.”
Oxeye Daisy – Leucanthemum vulgare IntroducedInvasive
Invasive in the US, and recorded in 15 of Colorado’s 64 counties. Colorado lists Oxeye Daisy under “List B.”
Poison Hemlock – Conium maculatum IntroducedInvasive
Invasive in the US, and recorded in 15 of Colorado’s 64 counties. Colorado lists Poison Hemlock under “List C.”
Proso Millet – Panicum miliaceum IntroducedInvasive
Invasive in the US, and recorded in 9 of Colorado’s 64 counties. Colorado lists Proso Millet under “List C.”
Puncturevine – Tribulus terrestris IntroducedInvasive
Invasive in the US, and recorded in 23 of Colorado’s 64 counties. Colorado lists Puncturevine under “List C.”
Quackgrass – Elymus repens IntroducedInvasive
Invasive in the US, and recorded in 26 of Colorado’s 64 counties. Colorado lists Quackgrass under “List C.”
Redstem Stork's Bill – Erodium cicutarium IntroducedInvasive
Invasive in the US, and recorded in 21 of Colorado’s 64 counties. Colorado lists Redstem Stork's Bill under “List C.”
Russian Olive – Elaeagnus angustifolia IntroducedInvasive
Invasive in the US, and recorded in 14 of Colorado’s 64 counties. Colorado lists Russian Olive under “List B.”
Saltlover – Halogeton glomeratus IntroducedInvasive
Invasive in the US, and recorded in 7 of Colorado’s 64 counties. Colorado lists Saltlover under “List C.”
Scentless False Mayweed – Tripleurospermum perforatum IntroducedInvasive
Invasive in the US, and recorded in 8 of Colorado’s 64 counties. Colorado lists Scentless False Mayweed under “List B.”
Scotch Cottonthistle – Onopordum acanthium IntroducedInvasive
Invasive in the US, and recorded in 8 of Colorado’s 64 counties. Colorado lists Scotch Cottonthistle under “List B.”
Siberian Elm – Ulmus pumila IntroducedInvasive
Invasive in the US, and recorded in 12 of Colorado’s 64 counties. Colorado lists Siberian Elm under “List C.”
Spiny Plumeless Thistle – Carduus acanthoides IntroducedInvasive
Invasive in the US, and recorded in 3 of Colorado’s 64 counties. Colorado lists Spiny Plumeless Thistle under “List B.”
Stinking Chamomile – Anthemis cotula IntroducedInvasive
Invasive in the US, and recorded in 5 of Colorado’s 64 counties. Colorado lists Stinking Chamomile under “List B.”
Sulphur Cinquefoil – Potentilla recta IntroducedInvasive
Invasive in the US, and recorded in 4 of Colorado’s 64 counties. Colorado lists Sulphur Cinquefoil under “List B.”
Tansy – Tanacetum vulgare IntroducedInvasive
Invasive in the US, and recorded in 4 of Colorado’s 64 counties. Colorado lists Tansy under “List B.”
Tree of Heaven – Ailanthus altissima IntroducedInvasive
Invasive in the US, and recorded in 3 of Colorado’s 64 counties. Colorado lists Tree of Heaven under “List C.”
Velvetleaf – Abutilon theophrasti IntroducedInvasive
Invasive in the US, and recorded in 2 of Colorado’s 64 counties. Colorado lists Velvetleaf under “List C.”
Yellow Nutsedge – Cyperus esculentus NativeListed
Recorded in 2 of Colorado’s 64 counties. Colorado lists Yellow Nutsedge under “List B.”
No plant on Colorado’s list matches that.
Want to check a plant by photo or county?
Use our “Is it native” tool for free.Compiled from the rule itself, retrieved July 20, 2026. Law changes; if you spot a listing we have wrong or stale, tell us at support@getezina.com.
The same list as a table
| Plant | Scientific name | Status | Plant instead |
|---|---|---|---|
| Bohemian Knotweed | Polygonum x bohemicum | ProhibitedColorado says “List A” | — |
| Camelthorn | Alhagi maurorum | ProhibitedInvasiveColorado says “List A” | — |
| Codlins and Cream | Epilobium hirsutum | ProhibitedInvasiveColorado says “List A” | — |
| Common Crupina | Crupina vulgaris | ProhibitedInvasiveColorado says “List A” | — |
| Creeping Spurge | Euphorbia myrsinites | ProhibitedColorado says “List A” | — |
| Cypress Spurge | Euphorbia cyparissias | ProhibitedInvasiveColorado says “List A” | Purple Love Grass, Douglas' Sedge, Bigseed Biscuitroot |
| Dyer's Woad | Isatis tinctoria | ProhibitedInvasiveColorado says “List A” | — |
| Elongated Mustard | Brassica elongata | ProhibitedColorado says “List A” | — |
| Flowering Rush | Butomus umbellatus | ProhibitedInvasiveColorado says “List A” | — |
| Giant Knotweed | Polygonum sachalinense | ProhibitedInvasiveColorado says “List A” | — |
| Giant Reed | Arundo donax | ProhibitedInvasiveColorado says “List A” | — |
| Harmal Peganum | Peganum harmala | ProhibitedInvasiveColorado says “List A” | — |
| Japanese Knotweed | Fallopia japonica (potentially invasive weed) | ProhibitedInvasiveColorado says “List A” | — |
| Kariba-Weed | Salvinia molesta | ProhibitedInvasiveColorado says “List A” | — |
| Meadow Knapweed | Centaurea x moncktonii | ProhibitedColorado says “List A” | — |
| Mediterranean Sage | Salvia aethiopis | ProhibitedInvasiveColorado says “List A” | — |
| Medusahead | Taeniatherum caput-medusae | ProhibitedInvasiveColorado says “List A” | — |
| North Africa Grass | Ventenata dubia | ProhibitedInvasiveColorado says “List A” | — |
| Orange Hawkweed | Hieracium aurantiacum | ProhibitedInvasiveColorado says “List A” | — |
| Paleyellow Iris | Iris pseudacorus | ProhibitedInvasiveColorado says “List A” | Rocky Mountain Pond-Lily, Pennsylvania Smartweed, Broadleaf Arrowhead |
| Parrot Feather Watermilfoil | Myriophyllum aquaticum | ProhibitedInvasiveColorado says “List A” | — |
| Purple Loosestrife | Lythrum salicaria | ProhibitedInvasiveColorado says “List A” | Canada Goldenrod, Cutleaf Waterparsnip, Common Cowparsnip |
| Rush Skeletonweed | Chondrilla juncea | ProhibitedInvasiveColorado says “List A” | — |
| Squarrose Knapweed | Centaurea virgata | ProhibitedColorado says “List A” | — |
| Stinking Willie | Senecio jacobaea | ProhibitedInvasiveColorado says “List A” | — |
| Waterthyme | Hydrilla verticillata | ProhibitedInvasiveColorado says “List A” | — |
| Yellow Star-Thistle | Centaurea solstitialis | ProhibitedInvasiveColorado says “List A” | — |
| Absinthium | Artemisia absinthium | ListedInvasiveColorado says “List B” | — |
| Black Henbane | Hyoscyamus niger | ListedInvasiveColorado says “List B” | — |
| Bouncingbet | Saponaria officinalis | ListedInvasiveColorado says “List B” | — |
| Broadleaved Pepperweed | Lepidium latifolium | ListedInvasiveColorado says “List B” | — |
| Broomleaf Toadflax | Linaria genistifolia | ListedColorado says “List B” | — |
| Bulbous Bluegrass | Poa bulbosa | ListedInvasiveColorado says “List C” | — |
| Bull Cottonthistle | Onopordum tauricum | ListedColorado says “List B” | — |
| Bull Thistle | Cirsium vulgare | ListedInvasiveColorado says “List B” | — |
| Butter and Eggs | Linaria vulgaris | ListedInvasiveColorado says “List B” | — |
| Canada Thistle | Cirsium arvense | ListedInvasiveColorado says “List B” | — |
| Caraway | Carum carvi | ListedInvasiveColorado says “List B” | — |
| Cheatgrass | Bromus tectorum | ListedInvasiveColorado says “List C” | — |
| Chicory | Cichorium intybus | ListedInvasiveColorado says “List C” | — |
| Common Mullein | Verbascum thapsus | ListedInvasiveColorado says “List C” | — |
| Common St. Johnswort | Hypericum perforatum | ListedInvasiveColorado says “List C” | — |
| Cutleaf Teasel | Dipsacus laciniatus | ListedInvasiveColorado says “List B” | — |
| Dalmatian Toadflax | Linaria dalmatica | ListedInvasiveColorado says “List B” | — |
| Dames Rocket | Hesperis matronalis | ListedInvasiveColorado says “List B” | Nettleleaf Giant Hyssop, Oneflower Helianthella, Woolly Yarrow |
| Diffuse Knapweed | Centaurea diffusa | ListedInvasiveColorado says “List B” | — |
| Eurasian Watermilfoil | Myriophyllum spicatum | ListedInvasiveColorado says “List B” | — |
| Field Bindweed | Convolvulus arvensis | ListedInvasiveColorado says “List C” | — |
| Field Sowthistle | Sonchus arvensis | ListedInvasiveColorado says “List C” | — |
| Fuller's Teasel | Dipsacus fullonum | ListedColorado says “List B” | — |
| Gypsyflower | Cynoglossum officinale | ListedInvasiveColorado says “List B” | — |
| Johnsongrass | Sorghum halepense | ListedInvasiveColorado says “List C” | — |
| Jointed Goatgrass | Aegilops cylindrica | ListedInvasiveColorado says “List B” | — |
| Knapweed | Centaurea x psammogena | ListedInvasiveColorado says “List B” | — |
| Leafy Spurge | Euphorbia esula | ListedInvasiveColorado says “List B” | — |
| Lenspod Whitetop | Cardaria chalepensis | ListedColorado says “List B” | — |
| Lesser Burdock | Arctium minus | ListedInvasiveColorado says “List C” | — |
| Moth Mullein | Verbascum blattaria | ListedInvasiveColorado says “List B” | — |
| Nodding Plumeless Thistle | Carduus nutans | ListedInvasiveColorado says “List B” | — |
| Oriental Virginsbower | Clematis orientalis | ListedColorado says “List B” | — |
| Oxeye Daisy | Leucanthemum vulgare | ListedInvasiveColorado says “List B” | — |
| Poison Hemlock | Conium maculatum | ListedInvasiveColorado says “List C” | — |
| Proso Millet | Panicum miliaceum | ListedInvasiveColorado says “List C” | — |
| Puncturevine | Tribulus terrestris | ListedInvasiveColorado says “List C” | — |
| Quackgrass | Elymus repens | ListedInvasiveColorado says “List C” | — |
| Redstem Stork's Bill | Erodium cicutarium | ListedInvasiveColorado says “List C” | — |
| Russian Olive | Elaeagnus angustifolia | ListedInvasiveColorado says “List B” | Basin Big Sagebrush, Silver Buffaloberry, Western Hackberry |
| Saltlover | Halogeton glomeratus | ListedInvasiveColorado says “List C” | — |
| Scentless False Mayweed | Tripleurospermum perforatum | ListedInvasiveColorado says “List B” | — |
| Scotch Cottonthistle | Onopordum acanthium | ListedInvasiveColorado says “List B” | — |
| Siberian Elm | Ulmus pumila | ListedInvasiveColorado says “List C” | Honey Locust, Osage-Orange, Quaking Aspen |
| Spiny Plumeless Thistle | Carduus acanthoides | ListedInvasiveColorado says “List B” | — |
| Stinking Chamomile | Anthemis cotula | ListedInvasiveColorado says “List B” | — |
| Sulphur Cinquefoil | Potentilla recta | ListedInvasiveColorado says “List B” | — |
| Tansy | Tanacetum vulgare | ListedInvasiveColorado says “List B” | — |
| Tree of Heaven | Ailanthus altissima | ListedInvasiveColorado says “List C” | Honey Locust, Osage-Orange, Quaking Aspen |
| Velvetleaf | Abutilon theophrasti | ListedInvasiveColorado says “List C” | — |
| Yellow Nutsedge | Cyperus esculentus | ListedColorado says “List B” | — |
Where this comes from
- Colorado listings
- 8 CCR 1206-2. Read the rule.
- Invasive status
- GRIIS, the Global Register of Introduced and Invasive Species, via GBIF, covering the lower 48 states. A scientific register with no legal force; it is cited separately from the statute above because the two disagree far more often than they agree. Garden crops it flags only for spreading from cultivation are left out after review.
- Status wording
- The Prohibited / Restricted / Listed chips are Ezina’s normalisation across 44 states and are not the legal term. Where Colorado’s own word for a plant differs from the chip, it is quoted verbatim beneath it.
- Nativity
- USDA PLANTS county distribution layer, surfaced through the county checker.
Regulated next door, but not in Colorado
Plants that two or more states bordering Colorado regulate, and Colorado does not. A listing is a legal act rather than an ecological one, so a plant can be a documented problem here and still be sold here.
- Maltese Star-Thistle Centaurea melitensis regulated in Arizona, New Mexico, Utah
- Asian Mustard Brassica tournefortii regulated in Arizona, Utah
- Common Reed Phragmites australis regulated in Nebraska, Utah
- Hardheads Acroptilon repens regulated in Arizona, Utah
- Red Star-Thistle Centaurea calcitrapa regulated in New Mexico, Utah
- Saltcedar Tamarix ramosissima regulated in Nebraska, Utah
- Sericea Lespedeza Lespedeza cuneata regulated in Kansas, Nebraska
- Spotted Knapweed Centaurea stoebe regulated in Kansas, Utah
- Spotted Knapweed Centaurea stoebe subsp. micranthos regulated in Nebraska, New Mexico
Questions
Is there an official Colorado invasive species list?
Not under that name. Colorado's legal list is a noxious-weed list: 78 plants named under 8 CCR 1206-2, an agricultural noxious-weed law, which governs control and spread on farmland and rights of way rather than what a nursery may sell. GRIIS, the Global Register of Introduced and Invasive Species, flags 67 of these 78 as invasive in the lower 48 states. That is an ecological finding, not a ruling by Colorado. This page shows both side by side.
What plants are illegal to sell in Colorado?
Colorado's list is an agricultural noxious-weed law, which governs control and spread on farmland and rights of way rather than what a nursery may sell. 78 plants are named under 8 CCR 1206-2. A noxious-weed listing does not automatically ban nursery sale, so check the rule itself before assuming a plant cannot be bought or sold.
Is my plant invasive in Colorado?
Search the table on this page for Colorado's legal determination, then look for the Invasive chip beside it, which is a separate ecological finding from GRIIS rather than a ruling by Colorado. A plant can carry one, both, or neither. For an address-level answer, enter the plant's name in Ezina's checker to get its Colorado status alongside whether USDA records it as native to your specific county. Every answer links the record it came from.
Is it illegal to plant these in Colorado?
Not necessarily, and the distinction matters. Colorado's list is an agricultural noxious-weed law: it obliges landowners to control these plants and restricts moving them, rather than making the act of planting one an offence in itself. 8 CCR 1206-2 is the text that says what is actually required of you, and it is linked beside every plant here.
Does a plant missing from this list mean it is safe to plant in Colorado?
No. This page reproduces what Colorado regulates, and a state list is a legal instrument rather than an ecological verdict. Plenty of plants spread aggressively without ever being listed, and states add species years after the problem is documented.
Grow natives easily with Ezina
How it works
We provide the tools you need to succeed.
010.1Identify
Add a plant
Snap a photo or type the name. Ezina matches it to a library of about 40,000 species and starts a care plan tailored to your zone, the local weather, and the time of year.
010.2Care
Get a care plan
A schedule built from local rain, temperature, and sun, not a fixed weekly cadence. You get a single notification when a plant actually needs water. Easily add treatments for diseases and pests.
010.3Plan
Explore new options
Our garden planner Dig helps you understand what works best for your location and makes suggestions based off your long term goals.
Add a plant
Snap a photo or type the name. Ezina matches it to a library of about 40,000 species and starts a care plan tailored to your zone, the local weather, and the time of year.
Get a care plan
A schedule built from local rain, temperature, and sun, not a fixed weekly cadence. You get a single notification when a plant actually needs water. Easily add treatments for diseases and pests.
Explore new options
Our garden planner Dig helps you understand what works best for your location and makes suggestions based off your long term goals.
Compiled from peer-reviewed research, USDA documentation,
and direct scientific observation across the United States.