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First the honest part: LetterAgent shipping labels cover Canada-only Xpresspost up to 5 kg, so cross-border plant shipping is outside what we do. More broadly, plants crossing the US-Canada border face plant-health rules. Most need a phytosanitary certificate, some species are banned outright, and soil is usually refused.
| Plant type | Crossing the US-Canada border |
|---|---|
| Most live plants, cuttings, bulbs | Phytosanitary certificate usually required from the exporting country's plant-health authority |
| Plants in soil | Almost always refused; ship bare-root with roots washed free of soil |
| Seeds | Regulated too, but simpler: often just a small-lots permit or clear labelling, species by species |
| Endangered or protected species | CITES permit may be required on top of everything else |
| Some fruits, vegetables, and nursery stock | May be prohibited outright or subject to quarantine depending on the pest situation that year |
Plant movement between the US and Canada is governed by plant-health rules on both sides. Going into the United States, the USDA's Animal and Plant Health Inspection Service (APHIS) is the authority. Most plants for planting need a phytosanitary certificate issued by the exporting country's plant-protection office, which certifies the plants were inspected and are free of the pests that country cares about. Some species also need an import permit obtained in advance. Going into Canada, the Canadian Food Inspection Agency (CFIA) sets equivalent requirements. The certificate is not a formality: it is the document inspectors ask for first, and a shipment without it can be held, returned, or destroyed.
Here is the part that surprises most people: the rules apply to the plants inside your box, not just to commercial nursery shipments. A houseplant cutting mailed to a friend is still a regulated article. The one real carve-out is seeds, which are lighter on paperwork but not paperwork-free. And note that LetterAgent's labels are Canada-only Xpresspost with a 5 kg cap, so an international plant shipment is a job for a carrier that handles cross-border customs paperwork.
Soil is the main thing border inspectors worry about. Soil carries nematodes, insect larvae, weed seeds, and fungi that do not show up in a quick visual inspection. That is why potted plants in soil are refused far more often than bare-root plants. "Bare root" means washing the roots free of growing medium, wrapping them in damp material, and shipping the plant without soil. Dormant bulbs and bare-root perennials travel best this way: they are small, tough, and spend the trip asleep.
This is also why buying plants from a seller across the border is different from buying one domestically. A reputable cross-border nursery already has its phytosanitary certification process running and builds the cost and timing into the sale. An individual seller on a marketplace often does not, which is where shipments get seized. If you are the sender, the certificate is your responsibility to arrange before the plant goes in the box.
Seeds sit in a middle category. They are regulated because they can carry seed-borne diseases and because some plants are invasive or noxious weeds. But the paperwork is usually lighter: clear species labelling, sometimes a small-lots-of-seed permit for US imports, and staying within quantity limits. Cuttings are treated like plants, not like seeds, because a cutting is already a living plant. So the herb sprigs you rooted in water need the same plant paperwork as a potted plant.
Two practical details that matter. First, declare honestly on the customs form. "Plant cuttings" is fine; a vague label like "gift" invites the inspection you are trying to avoid. Second, check species-level bans. Certain citrus, some stone fruit stock, and plants from regions with active pest outbreaks can be prohibited even with a certificate. Prohibited means prohibited: no paperwork overrides it.
Plant rules are not static. Both countries issue quarantines in response to specific pest outbreaks, and a species that crossed fine last year may be restricted this year. The spotted lanternfly, box tree moth, and emerald ash borer have all triggered shipping restrictions in North America at various times. Before sending anything, check the current requirements on the APHIS or CFIA site for your exact species. It takes ten minutes and it is the difference between a delivery and a destroyed package.
Ready to ship it? Get a shipping label with LetterAgent: describe it to your AI assistant, approve the exact quoted price, and get your label.
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