Crûg Farm Plants in North Wales has introduced hundreds of woodland perennials to British cultivation after legal collection trips to Vietnam and Taiwan.
You do not need a plant-hunting expedition to grow Arisaema candidissimum or Podophyllum delavayi, but you do need to understand the paperwork, the specialist nursery network and the quarantine routine that make international plant sourcing safe and legal. This guide covers the practical route from online research to a thriving plant in your garden.
Start with the phytosanitary certificate, not the shopping basket
Most countries require a phytosanitary certificate for live plants entering their borders. This document, issued by the exporting country’s plant health authority, confirms that the consignment has been inspected and is free from quarantine pests and diseases. In the United Kingdom, plants arriving from outside Great Britain must be accompanied by a phytosanitary certificate, and importers must pre-notify the authorities through the IPAFFS (Import of products, animals, food and feed system). Since 2021, plants moving from the European Union to Great Britain also require a phytosanitary certificate, with limited exceptions for small quantities of certain seeds.
A plant passport is different. Within the EU, professionally produced plants moving between member states carry a plant passport, which confirms traceability and pest-free status. When ordering from an EU nursery for delivery to the UK, you will usually need the export phytosanitary certificate in addition to the nursery’s internal plant passport.
“A phytosanitary certificate is not a promise that the plant will thrive. It is a snapshot of inspection at the time of export. The receiving gardener is still responsible for quarantine and ongoing plant health.”
Some plant groups are controlled by CITES (the Convention on International Trade in Endangered Species of Wild Fauna and Flora). Orchids in the genera Paphiopedilum and Phragmipedium, many cycads such as Encephalartos, and certain succulents in Aloe and Euphorbia require CITES export permits and import permits before they can legally cross borders. Always check the CITES appendices before placing an international order.
Where the rare plant trade actually happens
Specialist nurseries are the backbone of unusual plant sourcing. Unlike general garden centres, these businesses propagate their own stock, maintain detailed provenance records and are accustomed to international phytosanitary procedures. Pan Global Plants in Gloucestershire specialises in woody and herbaceous plants from East Asia, including Hydrangea aspera subsp. sargentiana and Disporum longistylum. Plant Delights Nursery in North Carolina, USA, holds one of the world’s largest selections of Arisaema species, with many grown from legally imported wild-collected seed. Far Reaches Farm in Washington State offers rare woodland perennials such as Podophyllum pleianthum and Paris polyphylla.
In continental Europe, Kwekerij De Hessenhof in the Netherlands lists more than 4,000 perennials, many unavailable elsewhere, while Esveld Aceretum, also Dutch, is a specialist in maples and other woody plants. Both ship internationally and are familiar with export documentation. Pépinière Aoba in France holds an exceptional collection of East Asian woodland plants, including rare Saruma henryi and Cautleya spicata.
Prices vary widely. A rare Arisaema tuber from a specialist nursery may cost £8–£25, while a mature Podophyllum delavayi division can reach £35–£60. Postage and phytosanitary fees add a further £25–£45 per order, so it is often more economical to group plants from one nursery rather than ordering single items from multiple sources.
Read a nursery like a plant health inspector
Not every nursery that advertises unusual plants online is equipped for international export. Before placing an order, check whether the nursery regularly issues phytosanitary certificates, whether it lists plant passport registration numbers on its website, and whether it offers pre-shipment photographs of the exact plant you will receive. A legitimate specialist will answer questions about propagation method, pot size and dormancy stage without hesitation.
Look for evidence of careful packing. Bare-root dormant plants travel well in early spring; actively growing plants need root-ball protection and fast courier services. Avoid nurseries that promise to send CITES-listed species without mentioning permits, or that offer “phytosanitary-free” shipping to countries that clearly require certificates.
“The best specialist nurseries will not sell you a plant they know will fail in quarantine. They will tell you to wait until the correct season, or they will refuse the order until you confirm you can meet its cultural needs.”
Seeds and bulbs as the sane alternative
For many collectors, seeds are a simpler and cheaper route to unusual plants. Seed of most non-CITES species can be imported without a phytosanitary certificate into the UK and many other countries, though some nations require a phytosanitary certificate for all seed. Jelitto Staudensamen in Germany offers a vast catalogue of perennial seed, including Meconopsis punicea and Roscoea cautleyoides. Plant World Seeds in Devon and Chiltern Seeds in Cumbria both list hard-to-find species and pack for international dispatch.
Bulbs and tubers usually do require a phytosanitary certificate because soil and storage pests are common risks. Jacques Amand International ships rare bulbs worldwide and routinely provides the necessary documentation. Rare Plants in the UK offers unusual woodland bulbs such as Erythronium revolutum and Fritillaria camschatcensis with full phytosanitary support.
The Alpine Garden Society and the Scottish Rock Garden Club run annual seed exchanges open to members, with seed donated by botanic gardens and specialist growers. This is one of the most cost-effective ways to obtain legally collected seed of rare alpines and woodland plants, often for less than £1 per packet.
Quarantine, acclimatisation and the first year
Once a plant arrives, quarantine is non-negotiable. Remove all packing material, inspect roots for vine weevil larvae or root mealybug, and wash off the old growing medium if the plant is not dormant. Repot into a sterile, free-draining mix appropriate to the species. Isolate the plant from your existing collection for at least four to six weeks, checking regularly for pests that may have survived inspection.
Do not place a newly imported plant in full sun or a prized border position immediately. Many unusual perennials, particularly woodland species such as Podophyllum and Paris, benefit from a period in a shaded cold frame or unheated greenhouse. Water carefully and avoid feeding until new growth appears. Biological controls such as nematodes for vine weevil can be applied to the potting mix as a preventive measure.
Label every plant with its full Latin name, source nursery and date of import. Keep the phytosanitary certificate and any CITES paperwork in a folder. If a pest or disease appears, you will need this information to trace the origin and to notify the relevant plant health authority if required.
Build a legal wish list for the long term
The most successful collectors treat sourcing as a year-round research project rather than an impulse purchase. Join specialist societies such as the Hardy Plant Society or the North American Rock Garden Society. Study their journals for nursery reviews and plant availability. Botanic gardens with Index Seminum programmes, such as Royal Botanic Gardens, Kew and Gothenburg Botanical Garden, offer seed of documented wild origin to non-commercial growers in exchange for a small fee.
When you find a desirable plant, research its native habitat, hardiness zone and CITES status before contacting a nursery. A Cypripedium japonicum may be legal but nearly impossible to grow outside a cool, shaded, moisture-retentive bed; a Paeonia rockii may be best bought as grafted stock from specialist peony nurseries such as Vivaio delle Peonie in Italy or De Bolderik in the Netherlands. The goal is not simply to acquire the plant, but to keep it alive and propagate it, so that future gardeners can source it without further pressure on wild populations.
International plant sourcing is a discipline as much as a pleasure. With the right paperwork, the right nursery relationships and a rigorous quarantine routine, you can grow Arisaema sikokianum, Podophyllum delavayi and dozens of other plants that have never appeared on a local garden centre bench. The plants are waiting; the only barrier is your own preparation.
The paperwork alone does not guarantee quarantine success. The critical step occurs after the plant has cleared inspection, when the importing gardener must judge whether to repot immediately or leave the root ball intact. Bleddyn and Sue Wynn-Jones of Crûg Farm Plants have developed a practical protocol over three decades of handling plants from Vietnam, Taiwan and Laos, and their method can be applied to any international order.
Wynn-Jones advises checking the growing medium first. Many Asian nurseries use a heavy clay-loam mix that retains too much moisture in a British pot. If the medium is dense and wet, wash off carefully with tepid water and repot into a bark-based, free-draining mix formulated for ericaceous plants. If the medium is open and gritty, leave the root ball undisturbed and place the pot directly into a shaded cold frame. The plant has already adjusted to that mix; changing it immediately can cause root shock.
Watering discipline is the second variable. A newly imported Arisaema tuber or Podophyllum rhizome arrives dry and dormant. One gentle watering upon potting is enough. The plant should not be watered again until the first shoot emerges. Overwatering is the single most common cause of failure in the first month. An underwatered plant can recover; a waterlogged tuber rots before it has chance to grow.
Temperature matters more than light. Many woodland species from East Asia grow in shaded forest understorey where soil temperatures remain cool even in high summer. A newly imported plant placed in a warm greenhouse or on a sunny kitchen windowsill will break dormancy too quickly, producing weak, etiolated growth. Wynn-Jones recommends a minimum temperature of 5–8°C during the acclimatisation period, with the pot sunk into sand or grit to moderate root-zone temperature.
“We have lost more plants to kindness than to neglect. A newly imported plant wants to be left alone in cool, damp shade. It does not want fertiliser, a larger pot or daily attention. The best thing you can do is walk away for three weeks.”
Timing the import matters. Plants ordered for delivery in late winter or very early spring, while they are still dormant, survive transport and quarantine far better than those shipped in full growth. A dormant Paris polyphylla rhizome packed in sphagnum moss can tolerate a week in transit; a leafy plant in active growth will suffer leaf desiccation and root disturbance. Specialist nurseries such as Pan Global Plants and Far Reaches Farm will advise the optimal shipping window for each genus, and the wise collector waits for that window rather than asking for immediate dispatch.
