Importing Plants

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Plants brought into Maine must:

  • be apparently free from plant pests,
  • have an inspection certificate issued by the appropriate regulatory agency of the state of origin attached to each package (Title 7 MRSA sec. 2214, Title 7 MRSA sec 2215)
  • meet the requirements of any quarantines maintained by the state or federal government that restrict the movement and sale of some plants to prevent the spread of plant pests.

Moving to Maine and want to bring your houseplants?

Plants grown indoors and moved to Maine as part of a persons belongings are allowed, but must meet the following criteria:

  • Plants must be apparently free from pests
  • Plants are not one of the species prohibited by Maine's plant health quarantines that are listed below
  • Plants are not a species that is prohibited from moving from the state of origin due to a local, state or federal quarantine.

Inspection (Nursery Stock) Certificate

An inspection certificate is a document issued by the appropriate regulatory agency, usually the department of agriculture, of the state of origin stating that the nursery or premises that the plants came from has been inspected and found to be free from pests.

Plant Quarantines

Maine has several quarantines in place to protect our plant and natural resources from harmful insects, diseases and plants. The following are some of Maine's regulations pertaining to plants commonly sold by the nursery industry. Please keep these regulations in mind when you are ordering and receiving shipments of plants. If your nursery in Maine is currently in possession of any of the plants mentioned here please contact Horticulture Program to discuss how to best dispose of them.

Hemlock woolly adelgid (HWA) quarantine

  • Hemlock (Tsuga sp.) trees are only allowed from certain areas with certification paperwork

HWA is a serious pest that attacks and kills hemlock trees, an important landscape and forest species in Maine. This pest is commonly found in many states, but its distribution within the state of Maine is limited. The further spread of HWA on hemlock nursery stock is of great concern. For this reason Maine maintains a quarantine regulating the movement of hemlock plant material into and within the state.

To meet the requirements of the HWA quarantine all hemlock plants coming into non-quarantined areas of Maine must originate from areas where HWA is not established and shipments must be accompanied by a certificate issued by the plant protection organization of the origin state.

More information on Importing Hemlock.

Emerald ash borer (EAB) quarantine

  • Ash (Fraxinus sp) trees are only allowed from areas free from emerald ash borer

EAB is a serious pest that attacks and kills ash trees. This pest is found in many states, but its distribution in Maine is limited. EAB can be spread to new areas on infested nursery stock, for this reason Maine maintains a quarantine regulating the movement of ash plant material into and within the state.

To meet the requirements of the EAB quarantine all ash plants coming into non-quarantined areas of Maine must orginate from areas where EAB is not established.

More information on EAB in Maine

White pine blister rust (WPBR) quarantine

  • Currants and gooseberry plants cannot be sold or planted in most areas of Maine

WPBR is a serious disease of white pine, a major forest and economic species in Maine. WPBR weakens and kills infected trees and can prevent the regeneration of white pine in some forest areas. In addition to infecting white pine, WPBR also infects Ribes species (currants and gooseberries). Ribes spp. play an important role in the survival and spread of the disease. Infections of WPBR cannot be passed from pine tree to pine tree, but must infect a ribes plant to spread to pine. For this reason the sale, transportation and possession of Ribes spp. is illegal throughout most of Maine and the sale and planting of Ribes nigrum (black currant) is illegal in the entire state of Maine. Some Ribes spp. (including red currants) may be sold in extreme northern and eastern portions of Maine.

More information on WPBR from the Maine Forest Service including a map of where some Ribes spp. may be planted.

Banned invasive terrestrial plants

  • 63 invasive terrestrial plants cannot be sold in Maine

The Maine Department of Agriculture, Conservation and Forestry has adopted rules (DOC 69KB) that prohibit the sale of 63 terrestrial plant species that meet the invasive plant criteria described in the rule. The plants are:

Scientific Name Common Name Effective Date
Acer ginnala Amur maple January 1, 2018
Acer platanoides Norway Maple January 1, 2018
Aegopodium podagraria Bishop's Weed January 1, 2018
Ailanthus altissima Tree of Heaven January 1, 2018
Alliaria petiolata Garlic Mustard January 1, 2018
Amorpha fruticosa False Indigo January 1, 2018
Ampelopsis glandulosa Porcelainberry January 1, 2018
Artemisia vulgaris Common Mugwort January 1, 2018
Berberis thunbergii Japanese Barberry January 1, 2018
Berberis vulgaris Common Barberry January 1, 2018
Celastrus orbiculatus Asiatic Bittersweet January 1, 2018
Elaeagnus umbellata Autumn Olive January 1, 2018
Euonymus alatus Winged Euonymus January 1, 2018
Euphorbia cyparissias Cypress Spurge January 1, 2018
Fallopia baldschuanica Chinese Bindweed January 1, 2018
Fallopia japonica Japanese Knotweed January 1, 2018
Frangula alnus Glossy Buckthorn January 1, 2018
Hesperis matronalis Dame's Rocket January 1, 2018
Impatiens glandulifera Ornamental Jewelweed January 1, 2018
Iris pseudacorus Yellow Iris January 1, 2018
Ligustrum vulgare Common Privet January 1, 2018
Lonicera japonica Japanese Honeysuckle January 1, 2018
Lonicera maackii Amur or Bush Honeysuckle January 1, 2018
Lonicera morrowii Morrow's Honeysuckle January 1, 2018
Lonicera tatarica Tatarian Honeysuckle January 1, 2018
Lythrum salicaria Purple Loosestrife January 1, 2018
Microstegium vimineum Stilt Grass January 1, 2018
Paulownia tomentosa Paulownia January 1, 2018
Persicaria perfoliata Mile-a-Minute Weed January 1, 2018
Phellodendron amurense Amur Cork Tree January 1, 2018
Populus alba White Cottonwood January 1, 2018
Robinia pseudoacacia Black Locust January 1, 2018
Rosa multiflora Multiflora Rose January 1, 2018
Alnus glutinosa European alder January 1, 2024
Angelica sylvestris Woodland angelica January 1, 2024
Anthriscus sylvestris wild chervil, raven's wing January 1, 2024
Aralia elata Japanese angelica tree January 1, 2024
Butomus umbellatus Flowering rush January 1, 2024
Elaeagnus angustifolia Russian olive January 1, 2024
Euonymus fortunei Wintercreeper, climbing spindle tree January 1, 2024
Festuca filiformis Fine-leaved sheep fescue January 1, 2024
Ficaria verna Lesser celandine January 1, 2024
Glaucium flavum Yellow hornpoppy January 1, 2024
Glechoma hederacea Ground ivy, creeping Charlie January 1, 2024
Glyceria maxima Great mannagrass, reed mannagrass January 1, 2024
Hippophae rhamnoides Sea buckthorn January 1, 2024
Ligustrum obtusifolium Border privet January 1, 2024
Lonicera xylosteum Dwarf honeysuckle January 1, 2024
Lythrum virgatum European wand loosestrife January 1, 2024
Miscanthus sacchariflorus Amur silvergrass January 1, 2024
Petasites japonicus Fuki, butterbur, giant butterbur January 1, 2024
Phalaris arundinacea Reed canary grass, variegated ribbon grass January 1, 2024
Photinia villosa Photinia, christmas berry January 1, 2024
Phragmites australis Common reed January 1, 2024
Phyllostachys aurea Golden bamboo January 1, 2024
Phyllostachys aureosulcata Yellow groove bamboo January 1, 2024
Pyrus calleryana Callery ("Bradford") pear January 1, 2024
Ranunculus repens Creeping buttercup January 1, 2024
Rubus phoenicolasius Wineberry January 1, 2024
Silphium perfoliatum Cup plant January 1, 2024
Sorbus aucuparia European mountain-ash January 1, 2024
Tussilago farfara Coltsfoot January 1, 2024
Valeriana officinalis Common valerian January 1, 2024

More information on Maine's invasive terrestrial plant rules

Banned invasive aquatic plants

  • Eleven aquatic plants cannot be sold in Maine.

The Maine Department of Agriculture, Conservation and Forestry along with the Maine Department of Environmental Protection are concerned with the introduction of foreign and invasive aquatic plants to Maine's waterways. The State of Maine has a law banning the sale, propagation and introduction of eleven aquatic plants considered invasive. These plants are:

  • Brazilian elodea (Egeria densa),
  • hydrilla (Hydrilla verticillata),
  • curly leaved pondweed (Potamogeton crispus),
  • parrot feather (Myriophyllum aquaticum),
  • European frogbit (Hydrocharis morsus-ranae),
  • variable leaf milfoil (Myriophyllum heterophyllum),
  • European naiad (Najas minor),
  • water chestnut (Trapa natans),
  • Eurasian milfoil (Myriophyllum spicatum),
  • yellow floating heart (Nymphoides peltata),
  • Fanwort (Cabomba caroliniana).

More information on Maine's aquatic invasive plant law from the Department of Environmental Protection