Mail Seed Paper Internationally Before Customs Holds Your Gift

Yes, you can usually mail seed paper internationally, but you need to check the destination country’s plant import rules first. Mailing seed paper is generally allowed, though it’s governed by phytosanitary requirements that vary by country and by postal restrictions on seeds. Before you package anything, review CFIA guidance on shipping seeds from Canada, and make sure your customs form accurately describes the contents so your gift doesn’t get held up or destroyed at the border.

TL;DR:

  • Check Canada Post’s destination listing first, then contact the destination’s plant protection authority or local CFIA office about unclear restrictions or certificate requirements.
  • A card qualifies for international letter post only if the card and envelope fit roughly 235 by 120 millimeters and weigh no more than 50 grams.
  • Protect seed paper in packaging that blocks moisture, avoid laminates and coatings, and accurately declare the seed mix, approximate weight, origin, and intended use.
  • Choose tracked or faster shipping for hot, humid, or lengthy routes; heat and moisture can reduce germination, so avoid promising recipients perfect results.
  • Recipients should plant the paper in warmed soil, cover it with about an eighth of an inch, and keep it moist without soaking.
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Table of Contents

A quick checklist before you package your seed paper card

Before you seal an envelope and head to the post office, run through a short list. It takes a few minutes and can save your card from being returned or destroyed overseas.

  • Confirm whether seeds are permitted in the destination country, and whether a phytosanitary certificate is required for entry.
  • Weigh and measure the card and envelope together to figure out if it qualifies as letter-post or needs parcel service.
  • Seal the seed paper in moisture-proof inner packaging, while keeping the planting instructions easy to find.
  • Declare the item honestly on customs forms as plantable seed paper, noting seed origin and approximate weight.
  • Choose a tracked or expedited shipping option if the trip crosses a hot or humid region, since heat and moisture shorten seed life.

Once you’ve worked through these points, you’re ready to prepare the actual package and paperwork, which is where most shipping mistakes happen.

How to prepare packaging, labelling and paperwork for shipping

Getting the packaging and the paperwork right is what separates a card that arrives ready to plant from one that gets flagged at customs. Here’s the order we recommend working through:

  1. Tuck the seed paper into a small moisture-proof pouch, and add a tiny desiccant packet if you’re mailing during a humid season.
  2. Choose an envelope or slim parcel that stays within letter-post dimensions where possible, since oversized items jump into pricier parcel categories.
  3. Skip lamination, glossy coatings or adhesive stickers directly on the paper itself. These treatments can make a card non-plantable, a point we cover in detail in our seed paper safety guidance.
  4. On the customs declaration, write out the contents clearly: wildflower or herb seed mix, approximate weight, country of origin, and intended use such as “gift, home garden.”
  5. If the destination requires formal clearance, ask about a phytosanitary certificate or seed analysis certificate before you ship, not after it’s already in transit.

Pro Tip: Keep a photo of your completed customs form and packaging before you drop the card in the mail, so you have a record if anything needs to be traced later.

Small, single-card shipments often fall under small-packet exemptions, but it’s worth confirming that before you rely on it.

Which authorities to check: Canada Post, CFIA and destination rules

Three sources carry the weight here, and checking them in order saves time. Start with Canada Post’s international destination listing, which flags whether a destination restricts or prohibits seeds and tells you which service options apply. From there, consult the CFIA’s shipping and exporting seeds page, which places responsibility on the exporter to confirm destination requirements and recommends contacting a local CFIA office when a shipment looks complicated.

  • Look up the destination country’s rules using Canada Post’s tool first.
  • Contact the destination country’s plant protection organization directly if the rules aren’t clear.
  • Confirm your plan with your local CFIA office before you ship anything unusual or in bulk.
  • Gather any documentation the destination requires: customs declaration, phytosanitary certificate, seed analysis certificate, or importer forms.

Skipping these steps carries real consequences. A package that arrives without the right paperwork can be destroyed at the border, returned to sender at your expense, or held while you scramble to produce missing documents. None of that happens often with a single personal card, but it’s exactly why checking first beats hoping for the best.

Choosing a Canada Post service and shipping speed for seed paper

Most single seed-paper cards are light and thin enough to qualify as letter-post, provided they stay within standard letter dimensions: roughly 235 mm by 120 mm and 50 grams for international letters. Anything bigger or heavier moves into a parcel category, which costs more but often includes tracking.

  • Letter-post or small packet: the cheapest route for a single card, best when speed isn’t urgent and the climate along the route is mild.
  • Tracked Packet: adds visibility without a huge price jump, useful when you want confirmation the card arrived.
  • Xpresspost or International Parcel: faster transit that reduces how long seeds sit in heat or humidity, worth the extra cost for warm destinations or time-sensitive occasions.

Faster, tracked services cost more but cut down the time seeds spend exposed to temperature swings, and they lower the risk of a card going missing entirely. For corporate gifting or bulk orders, consider adding insurance and confirm your customs paperwork is complete even on letter-post, since every international shipment needs an accurate declaration regardless of size.

What affects seed viability during international transit

Seeds are living things, and how you ship them matters. A systematic review of seed storage research found that under ambient, uncontrolled conditions, seed half-life often runs from a few to several years, while cool, dry storage extends that span considerably. Heat and humidity during a shipment, even over a few weeks, work against the same factors that preserve seeds in long-term storage.

In practice, that means keeping seed paper dry and shielded from temperature swings matters more than people expect for something travelling only a short distance. Moisture-barrier packaging and a small desiccant packet help, and choosing a faster shipping option during hot seasons reduces the stretch of time seeds sit in a warm cargo hold or sorting facility. If a card is heading somewhere with a long transit time or extreme summer heat, it’s worth letting the recipient know germination might be a little lower than usual rather than promising perfect results.

Four ways to protect seeds during transit

How to plant seed paper once it arrives

Planting seed paper is simple, and getting it right makes a real difference in how well it grows. Here’s what we recommend to recipients:

  • Loosen the top layer of soil in a pot or garden bed, indoors or out, depending on the season.
  • Plant the card whole or tear it into a few pieces, then lay it flat on the soil.
  • Cover it with about an eighth of an inch of soil, just enough to hold it in place.
  • Water lightly and keep the soil consistently moist, not soaked, while seeds germinate.
  • Wait until soil has warmed before planting outdoors, since cold, wet soil slows germination.

Avoid laminated cards, bleach, or harsh cleaning products anywhere near the paper, since these interfere with the seeds we embed, which are chosen to be non-GMO and non-invasive. For full step-by-step instructions and region-specific timing, our how-to-plant wildflower paper guide and our notes on soil temperature and timing walk through the details.

Why mailing seed paper responsibly matters

We believe seed-paper gifts are worth sending across borders, but only when the sender takes the rules seriously. A card that skips the import check isn’t just a wasted gift, it’s a package that puts a destination’s ecosystem at risk if non-native seeds slip through undeclared. That’s the whole reason phytosanitary rules exist, and respecting them is what keeps this kind of gifting sustainable rather than careless. Checking the destination’s requirements before you ship takes a few extra minutes and saves the card from ending up destroyed, unplanted, or both.

— Trevor

Order plantable cards built for international mailing

We make every card from 100% post-consumer recycled paper, embedded with non-GMO, non-invasive seeds, and crafted without plastic or adhesives, so your gift stays plantable all the way to wherever it’s going.

Sheep Thank You Card

If you’re sending a single thoughtful note, our Sheep Thank You Card is light enough to mail as a standard letter in most cases, and it’s fully plantable once it arrives. Sending gifts to a group or planning a bulk mailing for an event? Our 10 Pack, 15% off best-selling mixed occasions bundle covers a range of occasions at once and can suit shipments that fall under small-packet allowances. For a smaller seasonal touch, our Plantable Seasons Greetings Card Seal adds a compact plantable element to a card you’re already sending.

  • Cards ship without plastic packaging, keeping the whole mailing compostable.
  • Laminates and coatings that would stop the seeds from growing are avoided.
  • Planting and packing guides are freely available whether you’re shipping one card or a dozen.

If you’d like help combining a printed keepsake with a digital message for someone far away, Happy Milo’s guide to printing from a digital card is a useful companion resource.

Browse our full Plantable Greeting Cards line, or check out our Plantable Wedding Cards and Seed Paper Valentines collections if you’re planning ahead for a specific occasion.

FAQ

What is a seed paper card?

A seed paper card is a greeting card made from recycled paper embedded with real seeds, so instead of throwing it out, the recipient can plant the whole card and grow flowers, herbs or vegetables. Our cards use non-GMO, non-invasive seed varieties and come in a recycled kraft envelope.

What are the requirements for sending seeds overseas?

Requirements vary by destination, so check the receiving country’s import rules before shipping, since some places require a phytosanitary certificate while others allow small personal quantities with just an accurate customs declaration. CFIA guidance recommends contacting your local CFIA office if you’re unsure, and Canada Post’s international listing shows which destinations restrict seeds.

How much does seed paper cost?

Pricing depends on the specific card or bundle you choose, and current pricing for our Sheep Thank You Card, our 10-pack mixed-occasions bundle, and our Seasons Greetings Card Seal is listed on each product page. We don’t publish a flat rate since options range from single cards to discounted multi-packs.

How long can seed paper last?

Seed viability depends on storage conditions rather than a fixed shelf life. A systematic review of seed longevity research found that under ambient conditions seed half-life often runs about five to ten years, while cool, dry storage extends that considerably, so keeping seed paper away from heat and humidity before planting helps preserve germination potential.

Sources

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