Amur Honeysuckle – Lonicera maackii Not recorded hereInvasive
Invasive in the US, and recorded in no New Hampshire county. New Hampshire lists Amur Honeysuckle under “NH prohibited invasive species.”
New Hampshire invasive plants
New Hampshire (NH) regulates 16 invasive plants under N.H. Admin. Code Agr 3802.01. New Hampshire's list is a trade restriction, which governs what may be sold, propagated, or moved within the state — in plain terms, which plants are illegal to sell here.
New Hampshire invasive species list
New Hampshire restricts 16 plants, including Tree of Heaven, Japanese Knotweed and Amur Honeysuckle. Plants marked Prohibited may not be sold, propagated, or moved within New Hampshire. 16 of the 16 are also flagged invasive by GRIIS, which is an ecological finding rather than a ruling by New Hampshire. Checked against N.H. Admin. Code Agr 3802.01 on July 20, 2026.
Asiatic Tearthumb – Polygonum perfoliatum Not recorded hereInvasive
Invasive in the US, and recorded in no New Hampshire county. New Hampshire lists Asiatic Tearthumb under “NH prohibited invasive species.”
Black Alder – Alnus glutinosa Not recorded hereInvasive
Invasive in the US, and recorded in no New Hampshire county. New Hampshire lists Black Alder under “NH prohibited invasive species.”
Border Privet – Ligustrum obtusifolium IntroducedInvasive
Invasive in the US, and recorded in 1 of New Hampshire’s 10 counties. New Hampshire lists Border Privet under “NH prohibited invasive species.”
Broadleaved Pepperweed – Lepidium latifolium Not recorded hereInvasive
Invasive in the US, and recorded in no New Hampshire county. New Hampshire lists Broadleaved Pepperweed under “NH prohibited invasive species.”
Burning Bush – Euonymus alatus IntroducedInvasive
Invasive in the US, and recorded in 1 of New Hampshire’s 10 counties. New Hampshire lists Burning Bush under “NH prohibited invasive species.”
European Swallow-Wort – Cynanchum rossicum Not recorded hereInvasive
Invasive in the US, and recorded in no New Hampshire county. New Hampshire lists European Swallow-Wort under “NH prohibited invasive species.”
Garlic Mustard – Alliaria petiolata Not recorded hereInvasive
Invasive in the US, and recorded in no New Hampshire county. New Hampshire lists Garlic Mustard under “NH prohibited invasive species.”
Giant Knotweed – Polygonum sachalinense Not recorded hereInvasive
Invasive in the US, and recorded in no New Hampshire county. New Hampshire lists Giant Knotweed under “NH prohibited invasive species.”
Japanese Knotweed – Fallopia japonica (potentially invasive weed) IntroducedInvasive
Invasive in the US, and recorded in 8 of New Hampshire’s 10 counties. New Hampshire lists Japanese Knotweed under “NH prohibited invasive species.”
Kudzu – Pueraria montana Not recorded hereInvasive
Invasive in the US, and recorded in no New Hampshire county. New Hampshire lists Kudzu under “NH prohibited invasive species.”
Louise's Swallow-Wort – Cynanchum louiseae IntroducedInvasive
Invasive in the US, and recorded in 6 of New Hampshire’s 10 counties. New Hampshire lists Louise's Swallow-Wort under “NH prohibited invasive species.”
Nepalese Browntop – Microstegium vimineum Not recorded hereInvasive
Invasive in the US, and recorded in no New Hampshire county. New Hampshire lists Nepalese Browntop under “NH prohibited invasive species.”
Purple-Leaf Japanese Honeysuckle – Lonicera japonica 'Purpurea' IntroducedInvasive
Invasive in the US, and recorded in 2 of New Hampshire’s 10 counties. New Hampshire lists Purple-Leaf Japanese Honeysuckle under “NH prohibited invasive species.”
Tree of Heaven – Ailanthus altissima Not recorded hereInvasive
Invasive in the US, and recorded in no New Hampshire county. New Hampshire lists Tree of Heaven under “NH prohibited invasive species.”
Variegated Water Grass – Glyceria maxima 'Variegata' Not recorded hereInvasive
Invasive in the US, and recorded in no New Hampshire county. New Hampshire lists Variegated Water Grass under “NH prohibited invasive species.”
No plant on New Hampshire’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 |
|---|---|---|---|
| Amur Honeysuckle | Lonicera maackii | ProhibitedInvasiveNew Hampshire says “NH prohibited invasive species” | Common Witch Hazel, Smooth Sumac, Shining Willow |
| Asiatic Tearthumb | Polygonum perfoliatum | ProhibitedInvasiveNew Hampshire says “NH prohibited invasive species” | — |
| Black Alder | Alnus glutinosa | ProhibitedInvasiveNew Hampshire says “NH prohibited invasive species” | River/Red Birch, Balsam Poplar, Black Ash |
| Border Privet | Ligustrum obtusifolium | ProhibitedInvasiveNew Hampshire says “NH prohibited invasive species” | White Meadowsweet, Sandcherry, American Black Currant |
| Broadleaved Pepperweed | Lepidium latifolium | ProhibitedInvasiveNew Hampshire says “NH prohibited invasive species” | — |
| Burning Bush | Euonymus alatus | ProhibitedInvasiveNew Hampshire says “NH prohibited invasive species” | Mapleleaf Viburnum, Steeplebush, Rhodora |
| European Swallow-Wort | Cynanchum rossicum | ProhibitedInvasiveNew Hampshire says “NH prohibited invasive species” | — |
| Garlic Mustard | Alliaria petiolata | ProhibitedInvasiveNew Hampshire says “NH prohibited invasive species” | — |
| Giant Knotweed | Polygonum sachalinense | ProhibitedInvasiveNew Hampshire says “NH prohibited invasive species” | — |
| Japanese Knotweed | Fallopia japonica (potentially invasive weed) | ProhibitedInvasiveNew Hampshire says “NH prohibited invasive species” | — |
| Kudzu | Pueraria montana | ProhibitedInvasiveNew Hampshire says “NH prohibited invasive species” | Trumpet Honeysuckle, Riverbank Grape, Roundleaf Greenbrier |
| Louise's Swallow-Wort | Cynanchum louiseae | ProhibitedInvasiveNew Hampshire says “NH prohibited invasive species” | — |
| Nepalese Browntop | Microstegium vimineum | ProhibitedInvasiveNew Hampshire says “NH prohibited invasive species” | — |
| Purple-Leaf Japanese Honeysuckle | Lonicera japonica 'Purpurea' | ProhibitedInvasiveNew Hampshire says “NH prohibited invasive species” | Trumpet Honeysuckle, Devil's Darning Needles, Low False Bindweed |
| Tree of Heaven | Ailanthus altissima | ProhibitedInvasiveNew Hampshire says “NH prohibited invasive species” | Western Catalpa, Black Cherry, Sweet Birch |
| Variegated Water Grass | Glyceria maxima 'Variegata' | ProhibitedInvasiveNew Hampshire says “NH prohibited invasive species” | Rattlesnake Mannagrass, Melic Mannagrass, American Mannagrass |
Where this comes from
- New Hampshire listings
- N.H. Admin. Code Agr 3802.01. 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 New Hampshire’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 New Hampshire
Plants that two or more states bordering New Hampshire regulate, and New Hampshire 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.
- Bishop's Goutweed Aegopodium podagraria regulated in Maine, Massachusetts, Vermont
- Common Barberry Berberis vulgaris regulated in Maine, Massachusetts, Vermont
- Common Reed Phragmites australis regulated in Maine, Massachusetts, Vermont
- Flowering Rush Butomus umbellatus regulated in Maine, Massachusetts, Vermont
- Glossy Buckthorn Frangula alnus regulated in Maine, Massachusetts, Vermont
- Japanese Barberry Berberis thunbergii regulated in Maine, Massachusetts, Vermont
- Morrow's Honeysuckle Lonicera morrowii regulated in Maine, Massachusetts, Vermont
- Norway Maple Acer platanoides regulated in Maine, Massachusetts, Vermont
- Oriental Bittersweet Celastrus orbiculatus regulated in Maine, Massachusetts, Vermont
- Paleyellow Iris Iris pseudacorus regulated in Maine, Massachusetts, Vermont
- Purple Loosestrife Lythrum salicaria regulated in Maine, Massachusetts, Vermont
- Tatarian Honeysuckle Lonicera tatarica regulated in Maine, Massachusetts, Vermont
- Amur Corktree Phellodendron amurense regulated in Maine, Massachusetts
- Amur Maple Acer ginnala regulated in Maine, Vermont
- Amur Silvergrass Miscanthus sacchariflorus regulated in Maine, Massachusetts
Questions
Is there an official New Hampshire invasive species list?
Yes. N.H. Admin. Code Agr 3802.01 is New Hampshire's list, naming 16 plants under a trade restriction, which governs what may be sold, propagated, or moved within the state — in plain terms, which plants are illegal to sell here. GRIIS, the Global Register of Introduced and Invasive Species, flags all 16 as invasive in the lower 48 states. That is an ecological finding, not a ruling by New Hampshire. This page shows both side by side.
What plants are illegal to sell in New Hampshire?
16 plants are regulated under N.H. Admin. Code Agr 3802.01. Plants marked Prohibited may not be sold, propagated, or moved within New Hampshire. Plants marked Restricted carry narrower limits set by the rule.
Is my plant invasive in New Hampshire?
Search the table on this page for New Hampshire's legal determination, then look for the Invasive chip beside it, which is a separate ecological finding from GRIIS rather than a ruling by New Hampshire. 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 New Hampshire 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 New Hampshire?
For the plants marked Prohibited, N.H. Admin. Code Agr 3802.01 bars selling, propagating, or moving them within New Hampshire. Whether planting one you already own is itself an offence depends on that rule's exact wording, which is why every plant on this page links the citation rather than us paraphrasing it. Plants marked Restricted carry narrower limits the rule sets out.
Does a plant missing from this list mean it is safe to plant in New Hampshire?
No. This page reproduces what New Hampshire 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.